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servoshell: Fallback to light theme when initializing egui (#37228)

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Not all winit platforms support getting the system theme properly. In
some places we fall back to the light theme, but it seems that the
default for `egui` is dark. This change makes it so that we fall back to
the light theme more consistently, meaning that servoshell on Wayland
will properly use the light theme.

Testing: This is difficult to test because we have no servoshell display
tests.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-06-03 15:47:10 +02:00 • committed by GitHub
parent 5ef66ce386
commit c94605b13e
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1 changed files with 3 additions and 1 deletions
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4
ports/servoshell/desktop/egui_glue.rs
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@ -39,6 +39,7 @@ pub use egui_winit;
pub use egui_winit::EventResponse;
use egui_winit::winit;
use winit::event_loop::ActiveEventLoop;
use winit::window::Theme;
/// Use [`egui`] from a [`glow`] app based on [`winit`].
pub struct EguiGlow {
@ -63,6 +64,7 @@ impl EguiGlow {
})
.unwrap();
let theme = event_loop.system_theme().unwrap_or(Theme::Light);
let egui_ctx = egui::Context::default();
Self {
egui_winit: egui_winit::State::new(
@ -70,7 +72,7 @@ impl EguiGlow {
ViewportId::ROOT,
event_loop,
None,
event_loop.system_theme(),
Some(theme),
None,
),
egui_ctx,