When assigning tiles to a collision group in a not-ridiculously-large tilesource (32x32 tiles at 32x32 pixels each), the editor seems to take several seconds to do so, freezing up the entire time. This seems unusual given the very fast behaviour for other similar processes in the editor. Is there any particular reason (or bypass?) for this?
Of course, manually editing the .tilesource file is always an option (in some cases, this is even faster!), but this seems a bit silly.