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Maurice
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Since MapLibre 5's camera rewrite, the right-button rotate handler flips its sign whenever the cursor sits above a mid-screen line it derives by re-projecting the map center. That line drifts with the bearing by a fraction of a pixel, so inside the 100px band around the screen center a steady horizontal drag lands alternately above and below it — every processed movement reverses the previous one and the camera ping-pongs in place instead of rotating (#1545). A real hand crossing the line mid-drag flips the rotation direction outright. maplibre-gl 4.x rotated from plain horizontal movement and had none of this. Passing aroundCenter: false opts the handler out of the around-center mode and restores the 4.x/mapbox-gl behaviour: horizontal drag rotates, vertical drag pitches, in one continuous motion. Applied to all three GL map builds (planner, journey, settings preview); mapbox-gl keeps its options untouched.