Run 31446292343 disproved the z-order theory: the recording shows the
installer frontmost, red click-marker dots painting on it, and the button
rendered - yet ImageSearch missed on all 5 attempts. The reference crop is
the problem: it came from an H.264/yuv420p recording whose chroma
subsampling smears glyph edges. Diffing the crop against run 5's OWN
recording of the same screen gives max 8 shades/channel (matches easily),
so the crop is video-faithful but not screen-faithful, and no tolerance
fixes that reliably.
Keep ImageSearch as the first try, but fall back to PixelSearch for the
button text's saturated blue (~0x3B82F6, variation 90) in the window's
lower half - the only blue there (the title sits in the upper third).
Verify the click landed by the blue vanishing (the progress view replaces
the button); retry up to 10 times.
ethernet
5e6eab0cd3