Make sure the dragged window is smaller than work area in the target display

ash/wm/drag_window_resizer_unittest.cc

Index: ash/wm/drag_window_resizer_unittest.cc
diff --git a/ash/wm/drag_window_resizer_unittest.cc b/ash/wm/drag_window_resizer_unittest.cc
index 04e00f2f87e6005c15b010fa9cd39eb9040dd12b..72b96e7db01d0f87042e8226154edd62b9023d08 100644
--- a/ash/wm/drag_window_resizer_unittest.cc
+++ b/ash/wm/drag_window_resizer_unittest.cc
@@ -162,7 +162,7 @@ TEST_F(DragWindowResizerTest, WindowDragWithMultiDisplays) {
 
   // The secondary display is logically on the right, but on the system (e.g. X)
   // layer, it's below the primary one. See UpdateDisplay() in ash_test_base.cc.
-  UpdateDisplay("800x600,800x600");
+  UpdateDisplay("800x600,400x300");
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   ASSERT_EQ(2U, root_windows.size());
 
@@ -223,6 +223,55 @@ TEST_F(DragWindowResizerTest, WindowDragWithMultiDisplays) {
     EXPECT_EQ(base::IntToString(expected_x) + ",10 50x60",
               window_->bounds().ToString());
   }
+  // Dropping a window that is larger than the destination work area
+  // will shrink to fit to the work area.
+  window_->SetBoundsInScreen(gfx::Rect(0, 0, 700, 500),
+                             Shell::GetScreen()->GetPrimaryDisplay());
+  EXPECT_EQ(root_windows[0], window_->GetRootWindow());
+  {
+    // Grab the top-right edge of the window and move the pointer to (0, 10)
+    // in the secondary root window's coordinates.
+    scoped_ptr<WindowResizer> resizer(CreateDragWindowResizer(
+        window_.get(), gfx::Point(699, 0), HTCAPTION));
+    ASSERT_TRUE(resizer.get());
+    resizer->Drag(CalculateDragPoint(*resizer, 101, 10), ui::EF_CONTROL_DOWN);
+    resizer->CompleteDrag(0);
+    EXPECT_EQ(root_windows[1], window_->GetRootWindow());
+    // Window size should be adjusted to fit to the work area
+    EXPECT_EQ("400x253", window_->bounds().size().ToString());
+    gfx::Rect window_bounds_in_screen = window_->GetBoundsInScreen();
+    gfx::Rect intersect(window_->GetRootWindow()->GetBoundsInScreen());
+    intersect.Intersect(window_bounds_in_screen);
+    EXPECT_LE(10, intersect.width());
+    EXPECT_LE(10, intersect.height());
+    EXPECT_TRUE(window_bounds_in_screen.Contains(gfx::Point(800, 10)));
+  }
+
+  // Dropping a window that is larger than the destination work area
+  // will shrink to fit to the work area.
+  window_->SetBoundsInScreen(gfx::Rect(0, 0, 700, 500),
+                             Shell::GetScreen()->GetPrimaryDisplay());
+  EXPECT_EQ(root_windows[0], window_->GetRootWindow());
+  {
+    // Grab the top-left edge of the window and move the pointer to (150, 10)
+    // in the secondary root window's coordinates. Make sure the window is
+    // shrink in such a way that it keeps the cursor within.
+    scoped_ptr<WindowResizer> resizer(CreateDragWindowResizer(
+        window_.get(), gfx::Point(0, 0), HTCAPTION));
+    ASSERT_TRUE(resizer.get());
+    resizer->Drag(CalculateDragPoint(*resizer, 799, 10), ui::EF_CONTROL_DOWN);
+    resizer->Drag(CalculateDragPoint(*resizer, 850, 10), ui::EF_CONTROL_DOWN);
+    resizer->CompleteDrag(0);
+    EXPECT_EQ(root_windows[1], window_->GetRootWindow());
+    // Window size should be adjusted to fit to the work area
+    EXPECT_EQ("400x253", window_->bounds().size().ToString());
+    gfx::Rect window_bounds_in_screen = window_->GetBoundsInScreen();
+    gfx::Rect intersect(window_->GetRootWindow()->GetBoundsInScreen());
+    intersect.Intersect(window_bounds_in_screen);
+    EXPECT_LE(10, intersect.width());
+    EXPECT_LE(10, intersect.height());
+    EXPECT_TRUE(window_bounds_in_screen.Contains(gfx::Point(850, 10)));
+  }
 }
 
 // Verifies that dragging the active window to another display makes the new