6536fd80fc
The issue is in the `ED_region_overlap_isect_` family of functions I believe. Their purpose is to check if a coordinate is in the "non-transparent" or opaque parts of the overlapping region. These are getting event coordinates (in window space), converted to region relative space (substracting region->winrct). Comparison is in view space (through `UI_view2d_region_to_view_y`) to account for scrolling and zooming. The thing where it goes wrong is that we are actually comparing to `region->v2d.tot` (this can be huge, most of it not visible), where I think we should be comparing to `region->v2d.cur` (that is the part that is actually visible...) Swapping `region->v2d.tot` with `region->v2d.cur` is what this PR does. Pull Request: https://projects.blender.org/blender/blender/pulls/146032
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