gpui: Fix performance of app menu opening with large # of windows (#16939)
Piotr Osiewicz
created
This is officially my weirdest performance fix to date; With large # of
windows opening app menu could take a lot of time (we're talking few
seconds with 9 windows, a minute with 10 windows). The fix is to make
one method pub(crate).. What?
<img width="981" alt="image"
src="https://github.com/user-attachments/assets/83b26154-0acd-43ef-84b3-4b85cde36120">
We were spending most of the time on clear_pending_keystrokes, which -
funnily enough - called itself recursively. It turned out we have two
methods; `AppContext::clear_pending_keystrokes` and
WindowContext::clear_pending_keystrokes. The former calls the latter,
but - due to the fact that `WindowContext::clear_pending_keystrokes` is
private and `WindowContext` derefs to `AppContext` - `AppContext` one
ended up actually calling itself! The fix is plain and simple - marking
WindowContext one as pub(crate), so that it gets picked up as a method
to call over `AppContext::clear_pending_keystrokes`.
Closes #16895
Release Notes:
- Fixed app menu performance slowdowns when there are multiple windows
open.