Initial bookmark bar folder window tries harder to be on-screen....

chrome/browser/cocoa/bookmark_bar_folder_controller.mm

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/cocoa/bookmark_bar_folder_controller.h"
 #include "base/mac_util.h"
 #include "base/nsimage_cache_mac.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_utils.h"
@@ skipping 322 matching lines @@
     NSPoint buttonBottomLeftInScreen =
         [[parentButton_ window]
             convertBaseToScreen:[parentButton_
                                     convertPoint:NSZeroPoint toView:nil]];
     NSPoint bookmarkBarBottomLeftInScreen =
         [[parentButton_ window]
             convertBaseToScreen:[[parentButton_ superview]
                                     convertPoint:NSZeroPoint toView:nil]];
     newWindowTopLeft = NSMakePoint(buttonBottomLeftInScreen.x,
                                    bookmarkBarBottomLeftInScreen.y);
+    // Make sure the window is on-screen; if not, push left.  It is
+    // intentional that top level folders "push left" slightly
+    // different than subfolders.
+    NSRect screenFrame = [[[parentButton_ window] screen] frame];
+    CGFloat spillOff = (newWindowTopLeft.x + windowWidth) - NSMaxX(screenFrame);
+    if (spillOff > 0.0) {
+      newWindowTopLeft.x = std::max(newWindowTopLeft.x - spillOff,
+                                    NSMinX(screenFrame));
+    }
   } else {
     // Parent is a folder; grow right/left.
     newWindowTopLeft.x = [self childFolderWindowLeftForWidth:windowWidth];
     NSPoint top = NSMakePoint(0, (NSMaxY([parentButton_ frame]) +
                                   bookmarks::kBookmarkVerticalPadding));
     NSPoint topOfWindow =
         [[parentButton_ window]
             convertBaseToScreen:[[parentButton_ superview]
                                     convertPoint:top toView:nil]];
     newWindowTopLeft.y = topOfWindow.y;
@@ skipping 1012 matching lines @@
   return [folderController_ controllerForNode:node];
 }
 
 #pragma mark TestingAPI Only
 
 - (void)setIgnoreAnimations:(BOOL)ignore {
   ignoreAnimations_ = ignore;
 }
 
 @end  // BookmarkBarFolderController