'C-x u u' instead of 'C-x u C-x u' to undo many changes, 'C-x o o'
instead of 'C-x o C-x o' to switch windows, 'C-x { { } } ^ ^ v v' to
resize the selected window interactively, 'M-g n n p p' to navigate
-next-error matches. Any other key exits transient mode and then is
+next-error matches. Any other key exits repeat mode and then is
executed normally. 'repeat-exit-key' defines an additional key to
exit mode like 'isearch-exit' ('RET'). The user option
'repeat-exit-timeout' specifies the number of seconds of idle time to