Stick windows to sides of workspaces

ash/display/screen_position_controller.cc

 // Copyright (c) 2012 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 "ash/display/screen_position_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 144 matching lines @@
   //    the same root window even if the bounds is outside of the display.
   if (!window->transient_parent() &&
       !window->GetProperty(internal::kStayInSameRootWindowKey)) {
     aura::RootWindow* dst_root =
         Shell::GetInstance()->display_controller()->GetRootWindowForDisplayId(
             display.id());
     DCHECK(dst_root);
     aura::Window* dst_container = NULL;
     if (dst_root != window->GetRootWindow()) {
       int container_id = window->parent()->id();
+      // Dragging a docked window to another root window should show it floating
+      // rather than docked in another screen's dock.
+      if (container_id == kShellWindowId_DockContainer)
+        container_id = kShellWindowId_WorkspaceContainer;
       // All containers that uses screen coordinates must have valid window ids.
       DCHECK_GE(container_id, 0);
       // Don't move modal background.
       if (!SystemModalContainerLayoutManager::IsModalBackground(window))
         dst_container = Shell::GetContainer(dst_root, container_id);
     }
 
     if (dst_container && window->parent() != dst_container) {
       aura::Window* focused = aura::client::GetFocusClient(window)->
           GetFocusedWindow();
@@ skipping 28 matching lines @@
 
   gfx::Point origin(bounds.origin());
   const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
       window).bounds().origin();
   origin.Offset(-display_origin.x(), -display_origin.y());
   window->SetBounds(gfx::Rect(origin, bounds.size()));
 }
 
 }  // internal
 }  // ash