Support shift-rightclicking color picker buttons to copy the color to the clipboard in RRGGBBAA hex format.
Support shift-leftclicking color picker buttons to paste a color from the clipboard in RGB, RGBA, RRGGBB or RRGGBBAA format with optional leading `#` or `$`.
Remove the individual RGBA sliders for editor color pickers and only show one button that opens the color picker popup instead.
Decrease size of layer and point popups that previously had color properties which need less space now.
By replacing the editor specific color picker popup with the generic UI color picker popup.
Improve layout of the editor color picker button. Improve spacing and ensure that the button is square. Slightly enlarge button on mouse hover.
This otherwise breaks file loading because the file extension is expected in this input buffer even when the input is not rendered.
Regression from #6736.
6737: Refactor `str_copy` usages and buffer sizes in editor r=def- a=Robyt3
Use templated `str_copy` function in most cases to specify the correct buffer size.
Fixes two cases where the buffer size was hard-coded to a number.
Fix buffer size not being checked when copying auto mapper configuration name. Loading an auto mapper configuration with a name longer than 128 bytes could cause an out-of-bounds write.
Increase sizes of some text buffers that were potentially too small.
## Checklist
- [X] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Robert Müller <robytemueller@gmail.com>
Use templated `str_copy` function in most cases to specify the correct buffer size.
Fixes two cases where the buffer size was hard-coded to a number.
Fix buffer size not being checked when copying auto mapper configuration name. Loading an auto mapper configuration with a name longer than 128 bytes could cause an out-of-bounds write.
Increase sizes of some text buffers that were potentially too small.
- Support scrolling. Limit maximum height to 40% of screen height.
- Allow message to be empty.
- Use `std::vector` instead of `std::set` for entries to keep the user-defined order of entries.
- Add `m_SelectionIndex` in addition to `m_pSelection` to get selected item more conveniently for some use-cases.
- Make entry height, entry padding, entry spacing, font size, and popup width configurable.
- Allow alignment of selection popup with the top/bottom of another UI element.
- Support transparent selection buttons.
Store the list box active state inside `CListBox` instead of tracking it separately with a pointer.
Allow activating list boxes by clicking the scrollbar. Previously it was only possible to activate list boxes by selecting an item.
Fix country selection list box in players settings not being deactivated properly when name/clan edit boxes are active, because wrong UI element IDs were being used.
Support locking mouse position when dragging value selectors also in menus (color pickers), which improves usability of value selectors.
Previously this was only supported in the editor.
When enabling locked mouse a UI element ID must be specified. The mouse lock is stopped when this element is no longer active. This ensures that the mouse doesn't gets stuck in this state when the value selector isn't active anymore.
Same as for the envelope editor. Extract `RenderExtraEditorDragBar` function to reduce duplicate code.
Fix height being changed by repeated clicking on the draggable element by also resetting `s_Operation` when `Clicked` is `true`.
6639: Fix- Replaced usage of m_ProofBorders and m_MenuProofBorders with enum EProofBorder r=Robyt3 a=tarunsamanta2k20
<!-- What is the motivation for the changes of this pull request? -->
Changes requested.
closes#6609
<!-- Note that builds and other checks will be run for your change. Don't feel intimidated by failures in some of the checks. If you can't resolve them yourself, experienced devs can also resolve them before merging your pull request. -->
## Checklist
- [x] Tested the change ingame
- [x] Provided screenshots if it is a visual change
- [x] Tested in combination with possibly related configuration options
- [x] Written a unit test (especially base/) or added coverage to integration test
- [x] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [x] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Tarun Samanta <tarunsamanta77@gmail.com>
Co-authored-by: Tarun Samanta <55488549+tarunsamanta2k20@users.noreply.github.com>
The modified time was uninitialized for the editor file browser entry corresponding to the downloadedmaps-link. The time is never rendered for links, but the uninitialized time value was still passed to `str_timestamp_ex`, which results in an assertion error due to an incorrect time value being used when compiling with MSVC.
This is fixed by properly initializing the field and also by only calling `str_timestamp_ex` when the time value will be rendered.
Closes#6579.
6544: make envelope editor resizeable by dragging r=def- a=Marmare314
![resizeable-editor](https://user-images.githubusercontent.com/49279081/235273201-5ee620c3-3784-49d1-ac0c-3bc3d5aca440.gif)
## Checklist
- [x] Tested the change ingame
- [x] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [x] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
6542: potential fix for #6529 r=def- a=Marmare314
## Checklist
- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
Use the utility function to check if tele/speedup/switch/tune tile indices are valid.
Using `IsValidSwitchTile` fixes that the switch number and delay were not updated when selecting freeze, deep freeze, deep unfreeze, live freeze and live unfreeze tiles, as those tiles were missing in the existing condition.
Port the line input (UI edit boxes, chat, console) and Input Method Editor (IME) support from upstream. Closes#4397.
General
------------------------------
Fix issues with the text input. Closes#4346. Closes#4524.
Word skipping (when holding Ctrl) is overhauled to be consistent with the Windows / Firefox experience that I took as reference.
Improve usability by not blinking (i.e. always rendering) the caret shortly after is has been moved.
UI text input
------------------------------
Fix inconsistent mouse-based left and right scrolling (closes#4347).
Support smooth left and right scrolling.
Chat
------------------------------
Support keyboard-based text selection of the chat input.
Mouse-based selection could be support in the future when we decide to add something like an ingame UI cursor.
Support smooth up and down scrolling of the chat input, removing the old hack that offsets the input string to simulate scrolling.
Console
------------------------------
Also support mouse-based text selection of the command input.
Only text from either the command input or the console log can be selected at the same time. This ensures that Ctrl+C will always copy the text that is currently visually selected in the console.
Check for Ctrl+C input event in event handler instead of in render function, to hopefully fix the issue that copying does not work sometimes (closes#5974 until further notice).
When Ctrl+C is used to copy text from the console log, the selection is cleared. This should make it more clear when text was copied from the log.
Fix an issue that was preventing the console log selection from being cleared, when all log lines are selected.
Remove Ctrl+A/E hotkeys that move cursor to beginning/end respectively. Ctrl+A now selectes all text like for all other inputs. Home and End keys can still be used to go the beginning and end.
Remove Ctrl+U/K hotkeys that clear everything before/after the cursor respectively. Hold shift and use Home/End to select everything instead.
IME support
------------------------------
Render list of IME candidates in the client on Windows, so the candidate list can also be viewed in fullscreen mode. There is no API available to retrieve a candidate list on the other operating systems.
Improve composition rendering by underlining the composition text instead of putting it in square brackets.
Track active input globally to properly activate and deactivate IME through the SDL functions.
Closes#1030. Closes#1008.
Password rendering
------------------------------
Fix rendering of passwords containing unicode. Instead of rendering one star character for each UTF-8 `char`, render on star for every unicode codepoint.
Show the composition text also for passwords. Without seeing the composition text it's hard to type a password containing those characters. The candidate window exposes the composition anyway. If you don't want to expose your password this way, e.g. while streaming, you could:
1. Use a latin password and switch off the IME for the password input with the IME hotkey.
2. Blank your screen with an external program while you are streaming and entering passwords.
3. Use binds to authenticate in rcon or to set the server browser password.
Refactoring
------------------------------
Move all text input logic and general rendering to `CLineInput`.
A `CLineInput` is associated with a particular `char` buffer given as a pointer either in the constructor or with `SetBuffer`. The maximum byte size of the buffer must also be specified. The maximum length in unicode codepoints can also be specified separately (e.g. on upstream, name are limited by the number of unicode codepoints instead).
Add `CLineInputBuffered`, which is a `CLineInput` that own a `char` buffer of a fixed size, which is specified as a template argument. As `CLineInput` does not own a buffer anymore, this reduces duplicate code for line inputs that need their own buffer.
Add `CLineInputNumber` which has additional convenience functions to consider the text as an `int` or `float`, to reduce duplicate code in those cases. In the future we could also add an input filter function so that only numbers can be entered in the number input.
Add `CLineInput::SetClipboardLineCallback` to handle the case that multiple lines of text are pasted into a lineinput. This reduces duplicate code, as this behavior was previously implemented separately for chat and console. The behavior is also fixed to be consistent with the console on Windows, so the first line being pasted edits the current input text and then sends it instead of being sent on its own without the existing input text.
Add `CalcFontSizeAndBoundingBox` to UI to reduce duplicate code. Expose `CalcAlignedCursorPos` as static member function to reuse it for line input.
Dispatch input events to UI inputs through the event handler instead of storing them in a duplicate buffer.
Use `size_t` for line input cursor position, length etc. and for `str_utf8_stats`.
Add `IButtonColorFunction` to UI to describe a functions that defines colors for the Default, Active and Hovered states of UI elements. Add some default button color functions. Use button color function to reduce duplicate code in scrollbar rendering.
Use `vec2` instead of two `floats` to represent the mouse positions in the text renderer.
Remove `CaretPosition` again, as it does not calculate the correct Y position near line breaks due to the wrapping being different when not rendering the entire string. Instead, calculate the exact caret position when rending a text container and store the caret position in the text cursor for later use.
IME usage guide (Windows)
------------------------------
1. Install the respective language and the Microsoft-IME keyboard (e.g. for Chinese, Japanese or Korean).
2. Launch the game (or a text editor to first try out the IME). Note that Windows may track the input language separately for every application. You can change this in the Windows input settings so the input language is changed globally.
2. Switch the input language using the hotkey Windows+Space or another hotkey that you configured in the Windows input settings (Alt+Shift is the default, but you should consider disabling it, to avoid accidentally changing the input language while playing).
3. Switch from Latin/English input mode to the respective asian input mode.
- Chinese: Use Ctrl+Space to switch between English and Chinese input mode. You can change this hotkey in the IME's settings.
- Japanese: Use Ctrl+Space to switch between Alphanumeric and Hiragana/Katakana input mode. You can change this hotkey in the IME's settings.
- Korean: Use Right Alt to switch between English and Hangul input mode. You cannot change this hotkey as of yet.
- Note that the input mode is also tracked per application, but there is no setting to change this behavior as far as I know, so you'll need to switch for every application separately.
4. Start typing. The underlined text is the current composition text. While a composition is active, you can only edit the composition text. Confirm the composition with Space or by selecting a candidate from the candidate list with the arrow keys. Cancel the composition with Escape or by using Backspace to delete the composition text. Note that not all languages offer a candidate list.
SDL version-specific issues
------------------------------
- 2.26.5, 2.24.2, 2.0.22: IME candidates work. But there are minor bugs when moving the composition cursor.
- 2.0.18, 2.0.20: IME candidates work.
- 2.0.16 (our current version): IME candidates cannot be determined with Windows API. Windows tries to draw the composition window like before, so this does not work in fullscreen mode.
- 2.0.8 (upstream 0.7): IME candidates work. But this SDL version is too old for us.
6521: Minor refactoring of engine input r=Chairn a=Robyt3
## Checklist
- [X] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [X] Considered possible null pointers and out of bounds array indexing
- [X] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Robert Müller <robytemueller@gmail.com>
Add separate constants `TEXTALIGN_TOP`, `TEXTALIGN_MIDDLE` and `TEXTALIGN_BOTTOM` for vertical alignment.
Add shorthand constants for all possible combinations of horizontal and vertical alignment, e.g. `TEXTALIGN_MC` for `TEXTALIGN_MIDDLE | TEXTALIGN_CENTER`.
Replace usage of `SLabelProperties::m_AlignVertically` with these constants in all menu and editor code for more convenient and versatile alignment of text. Use combined horizontal-vertical alignment constants for all existing labels. Manually adjust layout for some elements which were initially misaligned with the new implementation.
Refactoring:
- Use `CORNER_NONE` instead of `0`.
- Improve some `CUIRect` variables names and usage.
Support using editor popup rendering in game client.
Support unlimited number of popup menus instead of maximum of 8.
Fix non-active popups handling key events. Add `Active` parameter to popup function, so key events are only processed by the active (top-most) popup. Previously the "New folder" popup could be confirmed with enter while an error message is shown, which causes multiple error messages to stack.
Allow popups to close without closing their child popups. Previously a popup could not open another popup and close itself immediately afterwards, as this was causing the newly opened popup to be closed instead.
Support using return/enter keys to confirm binary choice popups and to close message popups for more convenient usage.
There is not enought space for the button in the file browser on 4:3 and 5:4 resolutions.
The button fits in the file menu, as it allows to adjust the map details which are specific to the current map file.
When an image/sound is readded, this reuses the `ReplaceImage/Sound` callback functions. The added error handling to prevent duplicate images/sounds was causing this to not work, as the image/sound being readded was already present. The implementation is separated from the callback functions and an additional parameter is added to toggle the duplicate name check.
Previously this was hard to notice, as the error message popup was not shown due to the top-most popup being closed immediately. This will be fixed separately by a larger refactoring, so a popup can close itself immediately after opening another popup without closing the child popup instead.
Closes#6500.
Swap buttons so confirm button is on the right and cancel button is on the left consistently.
Decrease empty space and popup size.
Add missing title for `POPEVENT_LOADCURRENT` (caught by the added assertion).
Improve messages by adding additional empty line for existing line breaks.
To delete files and empty folders from the user's save directory.
Only files and folders from the user's save directory can be deleted. Only empty folders can be deleted.
Error message popups are shown when the deletion fails.
Closes#6272.
6443: Reveal selection when scrolling layer list with up/down arrow keys r=def- a=Robyt3
Closes#6441.
## Checklist
- [X] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Robert Müller <robytemueller@gmail.com>
The mouse slow flag must be reset at the beginning of the render function in the editor instead of at the beginning of the update function, as it otherwise only works very inconsistently.
The preview image was not being updated after the search term is changed. Changing the search term causes the selected image to be changed, so the preview image also needs to be updated.
If the preview image in the "Add image" dialog could not be loaded it was retried every frame, which causes a debug message to be printed each time.
Now a tristate variable is used to ensure that the image is not reloaded after is previously failed to load.
Show error message in a popup at the current mouse position when a file operation fails. Also works when pressing Ctrl+S to save.
When replacing images/sounds also first check if an image/sound with that name already exists.
When replacing sounds also first check whether the replacement sound could be loaded and don't replace existing sound with invalid sound on failure.
Replace existing error message for "Create folder" dialog with the new mechanism.
Closes#6430.
6433: add show directory button in filedialog closes#6422 r=Robyt3 a=Marmare314
## Checklist
- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [x] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
The `UI()->MouseInside(&View)` check does work when the mouse is all the way at the right or bottom side. Changing the `MouseInside` functions introduces other problems due to UI element and mouse positions being floating point numbers and not corresponding to exact pixels.
As a workaround to enable unlimited editor panning in all direction when the GUI is hidden the check is omitted, as the map editor encompasses the entire view and so the check is not necessary in this case.
Closes#4553.
6421: ignore tiles that dont use ids in ContainsElementWithId r=Robyt3 a=Marmare314
See #5908. As far as I can tell this function is only used in the popup, so this should not break anything.
## Checklist
- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
6419: add sorting by name and time modified to filedialog r=Robyt3 a=Marmare314
As suggested in #4508 it would be nice to have at least some basic sorting ability in the filedialog. This PR implements at least the two most important sorting criteria: filename and time modified. Also the time modified is now displayed.
At the moment the characters ▲ and ▼ are used to indicate the sorting direction. Maybe there is a nicer way to display this.
![file_dialog_1](https://user-images.githubusercontent.com/49279081/224561567-d3335ca0-d9c9-4d44-ab97-31ce177d287e.png)
![dialog_2](https://user-images.githubusercontent.com/49279081/224561570-4182ba16-bfe0-42d7-b2ee-0f49895fec85.png)
## Checklist
- [x] Tested the change ingame
- [x] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [x] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
When pasting text containing multiple consecutive (back)slashes in the editor save dialog not all slashes where removed. For example with the text `/a//bb/\/ccc////dddd//\//`.
6416: use ValueSelector for envelope selection #3598 r=def- a=Marmare314
Allow choosing envelopes by typing its ID.
## Checklist
- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [x] Considered possible null pointers and out of bounds array indexing
- [x] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: marmare314 <49279081+Marmare314@users.noreply.github.com>
6392: Add missing default value for custom parallax zoom property r=def- a=Robyt3
The "Custom Zoom" property was not initialized when creating a new layer group, leading to the property editor not working correctly and an undefined value being saved to the map file.
![property-editor](https://user-images.githubusercontent.com/23437060/223575784-81ce5eeb-992e-4084-985b-183b4389090c.png)
## Checklist
- [X] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Robert Müller <robytemueller@gmail.com>
The "Custom Zoom" property was not initialized when creating a new layer group, leading to the property editor not working correctly and an undefined value being saved to the map file.
Prevent editor popups (quad point, quad pivot, sound source) from being opened while the editor GUI is hidden. The opened popups would not be visible, which results in multiple identical popups being opened at the same time. This cannot happen while the GUI is shown, as the already opened popup takes focus so no second identical popup can be opened at the same time.
Additionally, all opened popups are now closed when the GUI is hidden. Otherwise this results in crashes, as the already opened popups reference the current layer and quad selection, which can change or become invalidated while the GUI is hidden.
Closes#6383.
Replacing the C standard headers with the C++ standard headers causes various `error: call to 'floor' promotes float to double [performance-type-promotion-in-math-fn,-warnings-as-errors]`, which are fixed by using the C++ std math functions or our own math functions instead of the C math functions.
- Use `absolute` instead of `abs` and `fabs`.
- Use `std::floor` instead of `floor` and `floorf`.
- Use `std::ceil` instead of `ceil`, `ceilf` and `round_ceil`.
- Use `std::round` instead of `round` and `roundf`.
- Use `std::sin` instead of `sin` and `sinf`.
- Use `std::asin` instead of `asin` and `asinf`.
- Use `std::cos` instead of `cos` and `cosf`.
- Use `std::acos` instead of `acos` and `acosf`.
- Use `std::tan` instead of `tan` and `tanf`.
- Use `std::atan` instead of `atan` and `atanf`.
- Use `std::pow` instead of `pow` and `powf`.
- Use `std::log` instead of `log` and `logf`.
- Use `std::log2` instead of `log2` and `log2f`.
- Use `std::log10` instead of `log10` and `log10f`.
- Use `std::pow` instead of `pow` and `powf`.
- Use `std::sqrt` instead of `sqrt` and `sqrtf`.
- Use `std::fmod` instead of `fmod` and `fmodf`.
- Use `direction(Angle)` instead of `vec2(std::cos(Angle), std::sin(Angle))`.
- Use `length(vec2(x, y))` instead of `std::sqrt(x * x + y * y)`.
- Remove unused `NormalizeAngular` and `AngularDistance` functions.
6282: Add a refresh button to the editor file browser r=heinrich5991 a=Robyt3
![screenshot_2023-01-13_22-51-07](https://user-images.githubusercontent.com/23437060/212426385-f8c03e58-8e5d-4c47-9f19-865946c5be9c.png)
## Checklist
- [X] Tested the change ingame
- [X] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Robert Müller <robytemueller@gmail.com>
The texture of the previous preview image was not unloaded before loading the texture of the new image.
The PNG data was never freed either. It's not necessary to keep this data loaded after loading the texture.
Using `str_format` without format arguments is equivalent to `str_copy`, but using the latter is more efficient and readable.
As `str_format` also returns the result `str_utf8_fix_truncation`, i.e. the potentially truncated string length, the return value is also added to `str_copy` so existing invocations don't need to be adjusted.
Keep all the UI elements in the envelope editor at the same position, independent from the number of channels of the selected envelope.
Previously the UI elements changed their position due to different numbers of channels of the different envelope types. Now the space for the maximum number of channels is always reserved and the UI elements don't move around.