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Neil
98df8806c6
Fractional display scaling was #12164's last unexplored branch, and the reason is worth recording: earlier attempts were BLOCKED, correctly, because they proposed mutating the Windows display scale on a remote physical machine with no console recovery. `--force-device-scale-factor` reaches the same renderer state per process, so nothing outside the Electron instance changes and there is nothing to restore. The hypothesis was specific: `프프로로젝젝트트` is what a half-pixel cell boundary could produce on a 2-column glyph, and nothing else in the suite varies dpr. Measured at 1.25 and 1.5, both under WebGL: ink extents 25/21/16 with identical ink groups, matching the scale-1 run. No doubling. The arm self-certifies before asserting — if the flag does not take, the test fails rather than silently measuring at dpr 1. That matters here: the sibling spec's WebGL arm went two days reporting a missing GPU as a Korean rendering defect precisely because a silent fallback looked like a result.