IDEA-146563 [regression] Middle-click on editor tabs, only closes one editor, the following middle-clicks are not registered

platform/platform-impl/src/com/intellij/ide/IdeEventQueue.java

@@ -26,7 +26,6 @@ import com.intellij.openapi.application.ex.ApplicationEx;
 import com.intellij.openapi.application.impl.LaterInvocator;
 import com.intellij.openapi.diagnostic.FrequentEventDetector;
 import com.intellij.openapi.diagnostic.Logger;
-import com.intellij.openapi.keymap.KeyboardSettingsExternalizable;
 import com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher;
 import com.intellij.openapi.keymap.impl.IdeMouseEventDispatcher;
 import com.intellij.openapi.keymap.impl.KeyState;
@@ -61,6 +60,9 @@ import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import static java.awt.event.MouseEvent.MOUSE_MOVED;
+import static java.awt.event.MouseEvent.MOUSE_PRESSED;
+
 /**
  * @author Vladimir Kondratyev
  * @author Anton Katilin
@@ -635,6 +637,12 @@ public class IdeEventQueue extends EventQueue {
     }
     else if (e instanceof MouseEvent) {
       MouseEvent me = (MouseEvent)e;
+      if (me.getID() == MOUSE_PRESSED && me.getModifiers() > 0 && me.getModifiersEx() == 0 ) {
+        // In case of these modifiers java.awt.Container#LightweightDispatcher.processMouseEvent() uses a recent 'active' component
+        // from inner WeakReference (see mouseEventTarget field) even if the component has been already removed from component hierarchy.
+        // So we have to reset this WeakReference with synthetic event just before processing of actual event
+        super.dispatchEvent(new MouseEvent(me.getComponent(), MOUSE_MOVED, me.getWhen(), 0, me.getX(), me.getY(), 0, false, 0));
+      }
       if (IdeMouseEventDispatcher.patchClickCount(me) && me.getID() == MouseEvent.MOUSE_CLICKED) {
         final MouseEvent toDispatch =
           new MouseEvent(me.getComponent(), me.getID(), System.currentTimeMillis(), me.getModifiers(), me.getX(), me.getY(), 1,