7b6ae7abbb
The issue is that timeline snapping code does not set the transform `values` to a rounded frame delta, instead, it adds the rounded distance between current source and target points to the unrounded `values` float, leaving it unrounded. Since snapping code is only run on some `transform_modal` calls due to "time base quirky code" in `transform_snap_mixed_apply`, sometimes frames briefly show mouse input added to `values` causing the strip to get transformed away from the snap target before the snap code is run once again. To fix this, set transform `values` to the exact rounded snap target frame diff (like in node snapping) instead of expecting it to get properly rounded for every call. Do this by changing `tsnap->snap_source[0]` to the original snap source on `transformInit`, not the updated snap source. Pull Request: https://projects.blender.org/blender/blender/pulls/123217
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