leonarski_fandClaude Opus 4.8
cc850f181d
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Overlay items live in scene coordinates, so QGraphicsView translates them natively as the view scrolls - no rebuild is required to keep them in the right place during a pan. Rebuilding on every scroll signal only re-ran the spot/prediction viewport culling, at the cost of tearing down and recreating every overlay item on each mouse-move step. Over remote X forwarding that per-step rebuild (and the rasterised pixels it dirties) is the dominant source of pan lag. Skip the rebuild while a pan drag is in progress: onScroll() returns early during a Panning gesture and the pan branch of mouseMoveEvent no longer schedules one. The overlay is refreshed once when the pan ends, via the existing mouseReleaseEvent -> updateROI() -> updateOverlay() path, which re-runs culling for the revealed viewport. Trade-off: spots/predictions in newly revealed regions appear on release rather than mid-drag. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>