Merge branch 'sh/blame-tooltip'

Make sure `git gui blame` tooltips are destroyed once the window loses
focus on MacOS.

* sh/blame-tooltip:
  git-gui: blame: prevent tool tips from sticking around after Command-Tab

Author: prati0100

lib/blame.tcl

@@ -328,6 +328,7 @@ constructor new {i_commit i_path i_jump} {
 		bind $i <Any-Motion>  [cb _show_tooltip $i @%x,%y]
 		bind $i <Any-Enter>   [cb _hide_tooltip]
 		bind $i <Any-Leave>   [cb _hide_tooltip]
+		bind $i <Deactivate>  [cb _hide_tooltip]
 		bind_button3 $i "
 			[cb _hide_tooltip]
 			set cursorX %x