Donut: a lost animation frame no longer keeps the slice under a dragged file dark (1.5.1)

[KnifeLemon]

What

Reported: Ctrl+drag opened the donut, but the slice under the dragged files didn't light up (and a drop didn't pick it), then a while later it worked again. The donut showing at all means the drag reached the window (in drag mode it stays invisible until files enter it), so the highlight is what failed.

• The donut's animations run in one frame loop. When a frame request is lost (e.g. requested while the window was hidden), the loop still counted as running and every later animation waited for it, so the highlight springs never moved. A loop without a frame for 250 ms is now treated as stopped and a new one starts; frames of the old loop are ignored.
• Each drag logs one line: move events, where it ended and how lit that slice was drawn, to tell "the drag never reached the donut" from "it did but nothing lit up" if this comes back.
• Version 1.5.1, CHANGELOG section.

Tests

New DonutHighlightTests: with the loop marked running and its last frame long ago (a lost frame), the highlighted slice still lights up. App 161.

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