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[core] Don't redo placement for zoom changes at low pitch. #10002
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Fixes issue #9996
Port of GL-JS mapbox/mapbox-gl-js#5284
This PR changes the "redo placement" logic to avoid triggering placement when the zoom level changes but (1) the pitch is relatively low (under 25 degrees), and (2) other transform parameters are unchanged.
/cc @jfirebaugh @ansis