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c8a0092301
Fixes #7937 Added `computeInitialSize` to GTK `Surface` and call it in GTK `Application` before the first `present()`, so the window manager centers the correct size on initial show. The issue occurs because the core `Surface.recomputeInitialSize()` runs only after the renderer is initialized. In GTK, the `GLArea` isn’t realized until after `present()`, so the initial size arrives too late for WM centering. **Limitations**: when we precompute size before `present()` we do not have access to padding, so the sizing will be very slightly off... but since it is only off a few pixels I was unable to tell visually that it wasn't perfectly centered. **Other thoughts**: I was hesitant to make changes to core `Surface` because the issue is Linux-specific, but it may make sense to extract a helper from `recomputeInitialSize` to avoid duplicating the sizing math. **AI Disclosure:** I used AI to explore the project, help with any language / API questions (I've never used zig before and rarely use gtk), and make implementation suggestions.