github issue #1145 - ^C-induced panic on tty

Issue reported by entrez:  on tty, ^C while a menu was open followed
by 'yes' to "Really quit?" would lead to a bad window panic.

Brought on by screen erasure changes included with recent SIGWINCH
(window resize signal) changes.

Closes #1145

doc/fixes3-7-0.txt

@@ -1823,6 +1823,8 @@ tty: for the !DEF_PAGER configuration, redraw screen properly if attempting
 	feedback for that situation
 tty: if a group accelerator matched a menu command ('^' in menu for '/')
 	it wouldn't work to select, just to manipulate the menu
+tty: after resize changes which included screen erasure changes, ^C and yes|y
+	to "Really quit?" while a menu was open would lead to a panic
 Unix: after lua changes to Makefiles, 'make spotless' for dat subdirectory
 	left some generated data files which should have been deleted
 Unix: reject "--sX" on command line except if "X" is "cores" (so "--scores");