Linux: Fake a mouse move event when the render view gains focus and the mouse...

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

Index: chrome/browser/renderer_host/render_widget_host_view_gtk.cc
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_gtk.cc	(revision 17106)
+++ chrome/browser/renderer_host/render_widget_host_view_gtk.cc	(working copy)
@@ -15,6 +15,7 @@
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/task.h"
+#include "base/time.h"
 #include "chrome/common/native_web_keyboard_event.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/x11_util.h"
@@ -113,6 +114,26 @@
 
   static gboolean OnFocusIn(GtkWidget* widget, GdkEventFocus* focus,
                             RenderWidgetHostViewGtk* host_view) {
+    int x, y;
+    gtk_widget_get_pointer(widget, &x, &y);
+    // If the cursor is in the render view, fake a mouse move event so that
+    // webkit updates its state. Otherwise webkit might think the cursor is
+    // somewhere it's not.
+    if (x >= 0 && y >= 0 && x < widget->allocation.width &&
+        y < widget->allocation.height) {
+      WebKit::WebMouseEvent fake_event;
+      fake_event.timeStampSeconds = base::Time::Now().ToDoubleT();
+      fake_event.modifiers = 0;
+      fake_event.windowX = fake_event.x = x;
+      fake_event.windowY = fake_event.y = y;
+      gdk_window_get_origin(widget->window, &x, &y);
+      fake_event.globalX = fake_event.x + x;
+      fake_event.globalY = fake_event.y + y;
+      fake_event.type = WebKit::WebInputEvent::MouseMove;
+      fake_event.button = WebKit::WebMouseEvent::ButtonNone;
+      host_view->GetRenderWidgetHost()->ForwardMouseEvent(fake_event);
+    }
+
     host_view->ShowCurrentCursor();
     host_view->GetRenderWidgetHost()->Focus();
     return FALSE;