embedder: Improve documentation for various places that talk about "available screen size" (#37879)

Testing: Just add comment. It turns out difficult to achieve, see
https://github.com/rust-windowing/winit/issues/2494.
Fixes: Nothing. Provide some guidance to #37878

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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Euclid Ye 2025-07-05 00:05:01 +08:00 committed by GitHub
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3 changed files with 6 additions and 2 deletions

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@ -431,6 +431,9 @@ impl WindowPortsMethods for Window {
);
let screen_size = self.screen_size.to_f32() * hidpi_factor;
// FIXME: In reality, this should subtract screen space used by the system interface
// elements, but it is difficult to get this value with `winit` currently. See:
// See https://github.com/rust-windowing/winit/issues/2494
let available_screen_size = screen_size - toolbar_size;
// Offset the WebView origin by the toolbar so that it reflects the actual viewport and