Window cycling hardcoded to keycode 50

Window cycling is hardcoded to happen when the Cmd key is pressed with
the key whose keycode = 50.  Having window cycling in the "Window" menu
means that window cycling stops working when the keyboard layout is
changed.  Thus revert back to the old way of dealing with this since it
seems to work better.

src/MacVim/MMAtsuiTextView.m

@@ -406,6 +406,12 @@ enum {
             && !(116 == [event keyCode] || 121 == [event keyCode]))
         return NO;
 
+    // HACK!  KeyCode 50 represent the key which switches between windows
+    // within an application (like Cmd+Tab is used to switch between
+    // applications).  Return NO here, else the window switching does not work.
+    if ([event keyCode] == 50)
+        return NO;
+
     // HACK!  Let the main menu try to handle any key down event, before
     // passing it on to vim, otherwise key equivalents for menus will
     // effectively be disabled.

src/MacVim/MMTextView.m

@@ -640,6 +640,12 @@ enum {
             && !(116 == [event keyCode] || 121 == [event keyCode]))
         return NO;
 
+    // HACK!  KeyCode 50 represent the key which switches between windows
+    // within an application (like Cmd+Tab is used to switch between
+    // applications).  Return NO here, else the window switching does not work.
+    if ([event keyCode] == 50)
+        return NO;
+
     // HACK!  Let the main menu try to handle any key down event, before
     // passing it on to vim, otherwise key equivalents for menus will
     // effectively be disabled.

src/MacVim/gvimrc

@@ -83,8 +83,6 @@ an <silent> 9900.301 Window.Minimize\ All       <Nop>
 an <silent> 9900.310 Window.Zoom                <Nop>
 an <silent> 9900.311 Window.Zoom\ All           <Nop>
 an <silent> 9900.320 Window.Toggle\ Full\ Screen\ Mode  :set invfullscreen<CR>
-an <silent> 9900.325 Window.Cycle\ Through\ Windows             <Nop>
-an <silent> 9900.326 Window.Cycle\ Backwards\ Through\ Windows  <Nop>
 an 9900.330 Window.-SEP1-                       <Nop>
 " TODO! Grey out if no tabs are visible.
 an <silent> 9900.340 Window.Previous\ Tab       :tabprevious<CR>
@@ -244,8 +242,6 @@ macm Window.Minimize\ All   key=<D-M-m>     action=miniaturizeAll:  alt=YES
 macm Window.Zoom            key=<D-C-z>     action=performZoom:
 macm Window.Zoom\ All       key=<D-M-C-z>   action=zoomAll:         alt=YES
 macm Window.Toggle\ Full\ Screen\ Mode  key=<D-F>
-macm Window.Cycle\ Through\ Windows     key=<D-`>   action=_cycleWindows:
-macm Window.Cycle\ Backwards\ Through\ Windows  key=<D-S-`> action=_cycleWindowsBackwards: alt=YES
 macm Window.Previous\ Tab               key=<D-{>
 macm Window.Next\ Tab                   key=<D-}>
 macm Window.Bring\ All\ To\ Front       action=arrangeInFront: