IDEA-144702 Unable to use Windows as a modifier key in keymap (registry key keymap.windows.as.meta=true by default)

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

@@ -138,6 +138,7 @@ public class IdeEventQueue extends EventQueue {
 
   private boolean myKeyboardBusy;
   private boolean myDispatchingFocusEvent;
+  private boolean myWinMetaPressed;
 
   private int myInputMethodLock;
 
@@ -370,6 +371,9 @@ public class IdeEventQueue extends EventQueue {
     e = fixNonEnglishKeyboardLayouts(e);
 
     e = mapEvent(e);
+    if (Registry.is("keymap.windows.as.meta")) {
+      e = mapMetaState(e);
+    }
 
     boolean wasInputEvent = myIsInInputEvent;
     myIsInInputEvent = e instanceof InputEvent || e instanceof InputMethodEvent || e instanceof WindowEvent || e instanceof ActionEvent;
@@ -530,6 +534,38 @@ public class IdeEventQueue extends EventQueue {
     return e;
   }
 
+  private AWTEvent mapMetaState(AWTEvent e) {
+    if (myWinMetaPressed) {
+      Application app = ApplicationManager.getApplication();
+      if (app == null || !app.isActive()) {
+        myWinMetaPressed = false;
+        return e;
+      }
+    }
+
+    if (e instanceof KeyEvent) {
+      KeyEvent ke = (KeyEvent)e;
+      if (ke.getKeyCode() == KeyEvent.VK_WINDOWS) {
+        if (ke.getID() == KeyEvent.KEY_PRESSED) myWinMetaPressed = true;
+        if (ke.getID() == KeyEvent.KEY_RELEASED) myWinMetaPressed = false;
+        return new KeyEvent(ke.getComponent(), ke.getID(), ke.getWhen(), ke.getModifiers(), KeyEvent.VK_META, ke.getKeyChar(),
+                            ke.getKeyLocation());
+      }
+      if (myWinMetaPressed) {
+        return new KeyEvent(ke.getComponent(), ke.getID(), ke.getWhen(), ke.getModifiers() | InputEvent.META_MASK, ke.getKeyCode(),
+                            ke.getKeyChar(), ke.getKeyLocation());
+      }
+    }
+
+    if (myWinMetaPressed && e instanceof MouseEvent && ((MouseEvent)e).getButton() != 0) {
+      MouseEvent me = (MouseEvent)e;
+      return new MouseEvent(me.getComponent(), me.getID(), me.getWhen(), me.getModifiers() | InputEvent.META_MASK, me.getX(), me.getY(),
+                            me.getClickCount(), me.isPopupTrigger(), me.getButton());
+    }
+
+    return e;
+  }
+
   public void _dispatchEvent(@NotNull AWTEvent e, boolean typeAheadFlushing) {
     if (e.getID() == MouseEvent.MOUSE_DRAGGED) {
       DnDManagerImpl dndManager = (DnDManagerImpl)DnDManager.getInstance();

platform/util/resources/misc/registry.properties

@@ -280,6 +280,7 @@ find.search.in.project.files=true
 structureView.coalesceTime=500
 
 keymap.show.alias.actions=false
+keymap.windows.as.meta=true
 frameworks.download.libraries.server.url=http://pluginsrepo-test:8080
 caches.indexerThreadsCount=-1
 navBar.updateMergeTime=100