Comment 92 for bug 160311

Right now you resize a window by finding the few pixels on the border that
allow you to drag the window.

I propose that the title bar have resize buttons for vertical, horizontal and
diagonal resize.

+---+---+---+--------------------------------+---+---+---+
| H | D | V | Window Title | _ | - | x |
+---+---+---+--------------------------------+---+---+---+

H = Horizontal resize
D = Diagonal resize
V = Vertical resize

Holding down left mouse button on these buttons and moving the mouse resizes.