event_loop.txt

Terminal -> SIGWINCH
curses_signal_handler() -> SigWinch=1 (needs to be atomic)

Event loops
-----------
	index/pager - custom call to km_dokey()
	Simple + others - menu_loop()
	mutt_enter_string_full() - custom km_dokey()
	questions: mutt_yesorno(), mutt_multi_choice(), query_quadoption()
		- custom mutt_getch()
	mutt_change_flag(), menu_dialog_dokey() - custom mutt_getch()

mutt_resize_screen()
	get LINES, COLUMNS
	NT_WINDOW ∀
external event, e.g. edit file
	resize and repaint

Event loop - RESIZE
	get_ch (convert to OP)
	resize
		mutt_resize_screen()
			set_root(cols, rows)
			window_reflow()
			window_notify_all()
		NT_WINDOW
		WA_RECALC
	redraw
		window_redraw()
			window_reflow()		# KILL
			window_notify_all()	# KILL
			window_recalc()
			window_repaint()

Ctrl-L (OP_REDRAW)
	get_ch (OP_REDRAW)
	window_invalidate(root)
		∀ win WA_REPAINT
	redraw
		window_redraw()		# clearok() first?
		window_recalc()
		window_repaint()	# refresh() after?

clearok()
	ctrl-L? YES
	resize? NO
	external? YES

extract RootWindow, NULL param -> RootWindow, static?

Resize (SBar) needs observer (NT_WINDOW) => WA_REPAINT
Resize (Sidebar) NT_WINDOW -> WA_RECALC -> WA_REPAINT
Resize (SimpleDlg) needs observer (NT_WINDOW) -> WA_RECALC, MENU_FULL, WA_REPAINT
	repaint() -> menu_redraw()
Ctrl-L (Index/Pager) -> win_invalidate(), win_redraw()
	Index needs observer(NT_WINDOW) -> WA_RECALC, MENU_FULL, WA_REPAINT
	Pager - same
OP_NULL - some op with no visual change (event loop startup)
	redraw -> window_redraw()
		=> window_recalc() NOOP
		=> window_repaint() NOOP

mutt_need_hard_redraw()
	external tools / pin entry

who repaint(force)?
	NONE => win_invalidate()