The tcgetpgrp call appears to have high variance in latency, ranging
from 200-700us on my system.
If you have 10 tabs and mouse over the tab bar, that's around 7ms
spent per frame just figuring out the foreground process; that doesn't
include actually extracting the process executable or current working
directory paths.
This was exacerbated by the mouse move events triggering a tab bar
recompute on every pixel of mouse movement.
This commit takes the following steps to resolve this:
* We now only re-compute the tab bar when the UI item is changed by
a mouse movement
* A simple single-item cache is now used on unix that allows the caller
to proceed quickly with stale-but-probably-still-mostly-accurate data
while queuing up an update to a background thread which can absorb
the latency.
The result of this is that hovering over several tabs in quick
succession no longer takes a noticeable length of time to render the
hover, but the consequence is that the contents of a given tab may be
stale by 300-400ms.
I think that trade-off is worth while.
We already have a similar trade-off on Windows, although we don't
yet do the updates in a different thread on Windows. Perhaps in
a follow up commit?
refs: https://github.com/wez/wezterm/issues/2991
On my mac, depending the config, I noticed that modals didn't always
render immediately; force a window invalidation after assigning to
encourage them to do so.
Add the key to enter Copy Mode to the table. It may be repetitive, but it
makes the table a useful cheatsheet.
Document `y`, it was undocumented.
Use kbd tag. Capitalize all keys with modifiers for consistency. Use mixed
case names for the modifiers. Use `+` for key combinations.
The recently added app delegate was telling cocoa that we'd decide
to quit later in response to termination requests, blocking
shutdown/logout/restart.
This commit introduces a macos native modal alert to let the user
decide whether to quit or not.
While testing this, I noticed that in some cases, our internal choice
to quit had no effect. Reading the fine print of NSApp::stop, it sounds
like calling it from a modal context will only stop a modal rather then
exit out of NSApp::run, so we explicitly bounce through an event
callback to try to make it exit from the right place.
I'm not 100% convinced by this. I've left some debug prints in for
now to see if those give some insight in the future.
refs: https://github.com/wez/wezterm/issues/2944
