LibGUI+WindowServer: Add a GResizeCorner widget.

This widget is automatically included in GStatusBar, but can be added in
any other place, too. When clicked (with the left button), it initiates a
window resize (using a WM request.)

In this patch I also fixed up some issues with override cursors being
cleared after the WindowServer finishes a drag or resize.

1 files changed, 0 insertions, 0 deletions

diff --git a/Base/res/icons/resize-corner.png b/Base/res/icons/resize-corner.png
new file mode 100644
index 0000000000..408b88b7da
--- /dev/null
+++ b/Base/res/icons/resize-corner.png