Backport from trunk.

       * nsmenu.m (update_frame_tool_bar): Return early if view or toolbar
is nil.  If waiting for toolbar to complete, force a redraw.
(free_frame_tool_bar): Set wait_for_tool_bar = NO

       * nsterm.h (EmacsView): Add wait_for_tool_bar.

* nsterm.m (updateFrameSize:): If waiting for the tool bar and tool
       bar is zero height, just return (Bug#16976).
       (initFrameFromEmacs:): Initialize wait_for_tool_bar.

1 files changed, 11 insertions, 4 deletions

diff --git a/src/nsmenu.m b/src/nsmenu.m
index f8cd07478ed..24842241f37 100644
--- a/src/nsmenu.m
+++ b/src/nsmenu.m
@@ -1054,8 +1054,10 @@ free_frame_tool_bar (struct frame *f)
     Under NS we just hide the toolbar until it might be needed again.
    -------------------------------------------------------------------------- */
 {
+  EmacsView *view = FRAME_NS_VIEW (f);
   block_input ();
-  [[FRAME_NS_VIEW (f) toolbar] setVisible: NO];
+  view->wait_for_tool_bar = NO;
+  [[view toolbar] setVisible: NO];
   FRAME_TOOLBAR_HEIGHT (f) = 0;
   unblock_input ();
 }
@@ -1071,6 +1073,7 @@ update_frame_tool_bar (struct frame *f)
   NSWindow *window = [view window];
   EmacsToolbar *toolbar = [view toolbar];
 
+  if (view == nil || toolbar == nil) return;
   block_input ();
 
 #ifdef NS_IMPL_COCOA
@@ -1176,9 +1179,13 @@ update_frame_tool_bar (struct frame *f)
   FRAME_TOOLBAR_HEIGHT (f) =
     NSHeight ([window frameRectForContentRect: NSMakeRect (0, 0, 0, 0)])
     - FRAME_NS_TITLEBAR_HEIGHT (f);
-    if (FRAME_TOOLBAR_HEIGHT (f) < 0) // happens if frame is fullscreen.
-      FRAME_TOOLBAR_HEIGHT (f) = 0;
-    unblock_input ();
+  if (FRAME_TOOLBAR_HEIGHT (f) < 0) // happens if frame is fullscreen.
+    FRAME_TOOLBAR_HEIGHT (f) = 0;
+
+  if (view->wait_for_tool_bar && FRAME_TOOLBAR_HEIGHT (f) > 0)
+      [view setNeedsDisplay: YES];
+
+  unblock_input ();
 }