Don't allow dropping dockables onto the tabs where textures sit

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManager.cpp

@@ -656,7 +656,7 @@ void ToolWindowManager::findSuggestions(ToolWindowManagerWrapper* wrapper) {
         m_suggestions << AreaReference(side, widget);
       }
     }
-    if (area && area->rect().contains(area->mapFromGlobal(globalPos))) {
+    if (area && area->allowUserDrop() && area->rect().contains(area->mapFromGlobal(globalPos))) {
       m_suggestions << AreaReference(AddTo, area);
     }
   }

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManagerArea.cpp

@@ -35,6 +35,7 @@ ToolWindowManagerArea::ToolWindowManagerArea(ToolWindowManager *manager, QWidget
   m_dragCanStart = false;
   m_tabDragCanStart = false;
   m_inTabMoved = false;
+  m_userCanDrop = true;
   setMovable(true);
   setTabsClosable(true);
   setDocumentMode(true);

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManagerArea.h

@@ -52,6 +52,11 @@ public:
    */
   void addToolWindows(const QList<QWidget*>& toolWindows);
 
+  void enableUserDrop() { m_userCanDrop = true; }
+  void disableUserDrop() { m_userCanDrop = false; }
+
+  bool allowUserDrop() { return m_userCanDrop; }
+
   /*!
    * Returns a list of all tool windows in this area.
    */
@@ -84,6 +89,8 @@ private:
                           // that can be considered as dragging current tab
                           // if the cursor will leave the tab bar area
 
+  bool m_userCanDrop; // indictes the user is allowed to drop things on this area
+
   bool m_inTabMoved; // if we're in the tabMoved() function (so if we call tabMove to cancel
                      // the movement, we shouldn't re-check the tabMoved behaviour)
 

qrenderdoc/Windows/TextureViewer.cpp

@@ -1463,6 +1463,8 @@ void TextureViewer::SetupTextureTabs()
                    &TextureViewer::textureTab_Changed);
   QObject::connect(textureTabs, &QTabWidget::tabCloseRequested, this,
                    &TextureViewer::textureTab_Closing);
+
+  textureTabs->disableUserDrop();
 }
 
 void TextureViewer::textureTab_Changed(int index)