** Save undo information in special temporary files, and reload it
when needed for undoing. This could extend undo capacity.
+ undo-tree, in ELPA, already does this; its saving code could be
+ integrated without requiring the use of undo-tree.
** Change the Windows NT menu code
so that it handles the deep_p argument and avoids
[As of trunk r109635, 2012-08-15, the event loop no longer polls.]
**** (mouse-avoidance-mode 'banish) then minimize Emacs, will pop window back
-up on top of all others
+up on top of all others (probably fixed in bug#17439)
**** free_frame_resources, face colors