Don't allow new windows to be created outside the monitor's work area....

chrome/browser/ui/views/tabs/dragged_tab_controller.cc

Index: chrome/browser/ui/views/tabs/dragged_tab_controller.cc
===================================================================
--- chrome/browser/ui/views/tabs/dragged_tab_controller.cc	(revision 72590)
+++ chrome/browser/ui/views/tabs/dragged_tab_controller.cc	(working copy)
@@ -34,6 +34,7 @@
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "views/event.h"
+#include "views/screen.h"
 #include "views/widget/root_view.h"
 #include "views/widget/widget.h"
 #include "views/window/window.h"
@@ -537,6 +538,18 @@
     // otherwise we may attempt to maximize on the wrong monitor.
     return cursor_point;
   }
+  // If the cursor is outside the monitor area, move it inside. For example,
+  // dropping a tab onto the task bar on Windows produces this situation.
+  gfx::Rect work_area = views::Screen::GetMonitorWorkAreaNearestPoint(
+      cursor_point);

[sky, 2011/01/27 00:22:07]

You should only do all this if work_area is not empty.

+  if (cursor_point.x() < work_area.x())
+    cursor_point.set_x(work_area.x());
+  else if (cursor_point.x() > work_area.right())
+    cursor_point.set_x(work_area.right());
+  if (cursor_point.y() < work_area.y())
+    cursor_point.set_y(work_area.y());
+  else if (cursor_point.y() > work_area.bottom())
+    cursor_point.set_y(work_area.bottom());
   return gfx::Point(cursor_point.x() - window_create_point_.x(),
                     cursor_point.y() - window_create_point_.y());
 }