fitToViewShorterSideOnce() skips the initial fit-to-view while the viewport has
no real size yet (before the widget is laid out/shown) and relies on a retry
that was never wired: resizeEvent only reset the scene rect, and there is no
showEvent. When the first Redraw() lands before layout settles the view stays
at 1:1, so a small grid-scan plot renders tiny ("zoomed out, not taking the
full picture"); the layout-timing race is why it happened only sometimes.
resizeEvent now retries fitToViewShorterSideOnce() while the initial fit is
still pending (guarded by !initial_fit_done_, so a later user resize never
overrides a manual zoom). It lives in the shared base class, so all image views
get the same robustness.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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