Patch for wl_pointer_set_focus re-entrant issue

[Christopher Michael]

Hi All,

Attached a patch which (appears) to fix the issue of using 
wl_pointer_set_focus(ptr, NULL, 0, 0) inside the compositor.

The short version: If the input has no focus_widget, then we cannot get 
the default cursor from: input->focus_widget->default_cursor.

This patch will try to get the cursor image from "widget" (which is set 
either from input->grab or from input->focus_widget) if it can. If input 
has no grab, and no focused_widget, then it resets cursor back to 
CURSOR_UNSET.

Cheers,
devilhorns
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