Trick — Reduce redraw lag when switching spaces

[devnoname120]

Add the following in ~/.config/yabai/yabairc:

yabai -m signal --add event=space_changed action="hs -A -c 'stackline.manager:update({forceRedraw = true})'"

Optional — comment out these lines to avoid a double redraw:

stackline/stackline/stackline.lua

Lines 146 to 156 in 215b35d

	stackline.spaceWatcher = hs.spaces.watcher.new( -- {{{
	function(spaceIdx)
	-- QUESTION: do I need to clean this up? If so, how?
	-- Update stackline when switching spaces
	-- NOTE: hs.spaces.watcher uses deprecated macos APIs, so this may break in an upcoming macos release
	log.i(('hs.spaces.watcher -> changed to space %d'):format(spaceIdx))
	stackline.forceRedraw = true -- force the next update cycle to redraw
	stackline.queryWindowState:start()
	stackline:refreshClickTracker()
	end
	):start() -- }}}

Why: It may be because hs.spaces.watcher() is using a macOS API that is deprecated since macOS 10.8. It always returns -1 as a space id to the callback on newer macOS versions[1].

See Hammerspoon/hammerspoon#3250

See #110 for another performance trick.

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[1] Confirmed on macOS Monterey 12.4.