In particular, when a frame has no minibuffer and is using that
of a different "normal" frame, C-x 5 o, etc., and GUI
operations fail.
Fix by partially reverting the commit from 2022-07-07 15:38:09
+0000 "Remove obscure, obsolete code from do_switch_frame". As
a consequent change, also revert the commit from 2022-07-08
20:19:03 +0000 "Remove now unused parameter TRACK from
do_switch_frame".
* src/frame.c (do_switch_frame): Restore the TRACK parameter.
Restore the code which redirects the frame focus when a new
frame gets selected.