On Linux the window was created fully transparent to draw rounded corners
(#1982), but on WebKitGTK a transparent window composites as transparent
whenever its web process is too busy to repaint damaged regions (for example
during a library backup). Interacting with the app then makes it appear to
turn invisible, showing the desktop through the window.
Make the window opaque everywhere: the main window in lib.rs and the
reader/extra windows in nav.ts. Drop the rounded-window treatment
(hasRoundedWindow=false) so no rounded 1px border floats on the now square
opaque window, and give the Linux loading placeholders a solid background.
An opaque window retains its last painted frame instead of going invisible;
the tradeoff is square corners on Linux.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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