Connor Tsui 6216af9b5a Allow dynamic set_theme based on Appearance (#42812)
Tracking Issue (does not close):
https://github.com/zed-industries/zed/issues/35552

This is somewhat of a blocker for
https://github.com/zed-industries/zed/pull/40035 (but also the current
behavior doesn't really make sense).

The current behavior of `ThemeSelectorDelegate::set_theme` (the theme
selector menu) is to simply set the in-memory settings to `Static`,
regardless of if it is currently `Dynamic`. The reason this doesn't
matter now is that the `theme::set_theme` function that updates the
user's settings file _will_ make this check, so dynamic settings stay
dynamic in `settings.json`, but not in memory.

But this is also sort of strange, because `theme::set_theme` will set
the setting of whatever the old appearance was to the new theme name. In
other words, if I am currently on a light mode theme and I change my
theme to a dark mode theme using the theme selector, the `light` field
of `theme` in `settings.json` is set to a dark mode theme!

_I think this is because displaying the new theme in the theme selector
does not update the global context, so
`ThemeSettings::get_global(cx).theme.name(appearance).0` returns the
original theme appearance, not the new one._

---

This PR makes `ThemeSelectorDelegate::set_theme` keep the current
`ThemeSelection`, as well as changes the behavior of the
`theme::set_theme` call to always choose the correct setting to update.

One edge case that might be slightly strange now is that if the user has
specified the mode as `System`, this will now override that with the
appearance of the new theme. I think this is fine, as otherwise a user
might set a dark theme and nothing will change because the
`ThemeAppearanceMode` is set to `light` or `system` (where `system` is
also light).

I also have an `unreachable!` in there that I'm pretty sure is true but
I don't really know how to formally prove that...

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>
2025-12-01 20:52:57 -07:00
2025-10-21 09:58:26 +02:00
2025-10-17 18:49:11 +02:00
2025-12-01 14:08:07 -08:00
2025-09-23 16:49:45 +00:00
2025-05-17 12:34:42 +00:00
2025-09-16 21:58:40 +00:00
2025-10-27 13:27:59 -04:00
WIP
2023-12-14 09:25:14 -07:00
2025-03-10 01:06:11 -07:00
2025-11-12 20:27:04 +00:00
2024-09-30 17:46:21 -04:00
2025-11-12 20:27:04 +00:00
2025-02-04 09:02:59 -05:00
2025-02-04 09:02:59 -05:00
2025-10-27 13:27:59 -04:00
2025-11-10 22:05:46 +00:00
2025-10-17 18:58:14 +00:00
2025-03-10 01:06:11 -07:00

Zed

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Code at the speed of thought – Zed is a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
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