Linux: work around browser windows that get stuck maximized by the WM.

chrome/browser/gtk/browser_window_gtk.cc

Index: chrome/browser/gtk/browser_window_gtk.cc
===================================================================
--- chrome/browser/gtk/browser_window_gtk.cc	(revision 27114)
+++ chrome/browser/gtk/browser_window_gtk.cc	(working copy)
@@ -1378,6 +1378,17 @@
   SaveWindowPosition();
 }
 
+void BrowserWindowGtk::UnMaximize() {
+  // It can happen that you end up with a window whose restore size is the same
+  // as the size of the screen, so unmaximizing it merely remaximizes it due to
+  // the same WM feature that SetWindowSize() works around.  We try to detect
+  // this and resize the window to work around the issue.
+  if (bounds_.size() == restored_bounds_.size())
+    gtk_window_resize(window_, bounds_.width(), bounds_.height() - 1);
+  else
+    gtk_window_unmaximize(window_);
+}
+
 bool BrowserWindowGtk::CanClose() const {
 #if defined(OS_CHROMEOS)
   if (drag_active_)
@@ -2004,7 +2015,7 @@
       if (has_hit_titlebar) {
         // Maximize/restore on double click.
         if (browser->IsMaximized()) {
-          gtk_window_unmaximize(browser->window_);
+          browser->UnMaximize();
         } else {
           gtk_window_maximize(browser->window_);
         }