Don't reserve space for an auto-hide taskbar that's not always-on-top. Windo...

chrome/browser/views/frame/browser_frame.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/views/frame/browser_frame.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "chrome/browser/browser_list.h"
@@ skipping 120 matching lines @@
   if (browser_view_->IsMaximized()) {
     // Make the maximized mode client rect fit the screen exactly, by
     // subtracting the border Windows automatically adds for maximized mode.
     border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
     // Find all auto-hide taskbars along the screen edges and adjust in by the
     // thickness of the auto-hide taskbar on each such edge, so the window isn't
     // treated as a "fullscreen app", which would cause the taskbars to
     // disappear.
     HMONITOR monitor = MonitorFromWindow(GetNativeView(),
                                          MONITOR_DEFAULTTONEAREST);
-    if (win_util::EdgeHasAutoHideTaskbar(ABE_LEFT, monitor))
+    if (win_util::EdgeHasTopmostAutoHideTaskbar(ABE_LEFT, monitor))
       client_rect->left += win_util::kAutoHideTaskbarThicknessPx;
-    if (win_util::EdgeHasAutoHideTaskbar(ABE_RIGHT, monitor))
+    if (win_util::EdgeHasTopmostAutoHideTaskbar(ABE_RIGHT, monitor))
       client_rect->right -= win_util::kAutoHideTaskbarThicknessPx;
-    if (win_util::EdgeHasAutoHideTaskbar(ABE_BOTTOM, monitor)) {
+    if (win_util::EdgeHasTopmostAutoHideTaskbar(ABE_BOTTOM, monitor)) {
       client_rect->bottom -= win_util::kAutoHideTaskbarThicknessPx;
-    } else if (win_util::EdgeHasAutoHideTaskbar(ABE_TOP, monitor)) {
+    } else if (win_util::EdgeHasTopmostAutoHideTaskbar(ABE_TOP, monitor)) {
       // Tricky bit.  Due to a bug in DwmDefWindowProc()'s handling of
       // WM_NCHITTEST, having any nonclient area atop the window causes the
       // caption buttons to draw onscreen but not respond to mouse hover/clicks.
       // So for a taskbar at the screen top, we can't push the client_rect->top
       // down; instead, we move the bottom up by one pixel, which is the
       // smallest change we can make and still get a client area less than the
       // screen size. This is visibly ugly, but there seems to be no better
       // solution.
       --client_rect->bottom;
     }
@@ skipping 68 matching lines @@
     margins.cyBottomHeight = kClientEdgeThickness + 1;
   }
   // In maximized mode, we only have a titlebar strip of glass, no side/bottom
   // borders.
   if (!browser_view_->IsFullscreen()) {
     margins.cyTopHeight =
         GetBoundsForTabStrip(browser_view_->tabstrip()).bottom();
   }
   DwmExtendFrameIntoClientArea(GetNativeView(), &margins);
 }