Merge #6408

6408: Fix some potentially undefined editor member variables r=def- a=Robyt3

See #6407.

## 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>

src/game/editor/editor.cpp

@@ -96,6 +96,7 @@ CEditorSound::~CEditorSound()
 
 CLayerGroup::CLayerGroup()
 {
+	m_vpLayers.clear();
 	m_aName[0] = 0;
 	m_Visible = true;
 	m_Collapse = false;

src/game/editor/editor.h

@@ -301,6 +301,7 @@ public:
 	{
 		m_pEditor = pEditor;
 		m_aName[0] = 0;
+		m_Texture.Invalidate();
 		m_External = 0;
 		m_Width = 0;
 		m_Height = 0;
@@ -767,6 +768,13 @@ public:
 		m_pTextRender = nullptr;
 		m_pSound = nullptr;
 
+		m_EntitiesTexture.Invalidate();
+		m_FrontTexture.Invalidate();
+		m_TeleTexture.Invalidate();
+		m_SpeedupTexture.Invalidate();
+		m_SwitchTexture.Invalidate();
+		m_TuneTexture.Invalidate();
+
 		m_Mode = MODE_LAYERS;
 		m_Dialog = 0;
 		m_EditBoxActive = 0;
@@ -799,6 +807,9 @@ public:
 		m_FileDialogOpening = false;
 		m_FilesSelectedIndex = -1;
 
+		m_FilePreviewImage.Invalidate();
+		m_PreviewImageIsLoaded = false;
+
 		m_SelectEntitiesImage = "DDNet";
 
 		m_WorldOffsetX = 0;
@@ -838,6 +849,10 @@ public:
 		m_QuadKnifeActive = false;
 		m_QuadKnifeCount = 0;
 
+		m_CheckerTexture.Invalidate();
+		m_BackgroundTexture.Invalidate();
+		m_CursorTexture.Invalidate();
+
 		m_CommandBox = 0.0f;
 		m_aSettingsCommand[0] = 0;
 

src/game/editor/layer_tiles.cpp

@@ -18,6 +18,7 @@ CLayerTiles::CLayerTiles(int w, int h)
 	m_aName[0] = '\0';
 	m_Width = w;
 	m_Height = h;
+	m_Texture.Invalidate();
 	m_Image = -1;
 	m_Game = 0;
 	m_Color.r = 255;
@@ -910,7 +911,7 @@ int CLayerTiles::RenderProperties(CUIRect *pToolBox)
 				m_pEditor->m_PopupEventType = m_pEditor->POPEVENT_IMAGEDIV16;
 				m_pEditor->m_PopupEventActivated = true;
 
-				m_Texture = IGraphics::CTextureHandle();
+				m_Texture.Invalidate();
 				m_Image = -1;
 			}
 		}