Error R6025 - pure virtual function call on SWS/BR: Toggle preview take under mouse

[lordgeyik]

I get the error in the title and Reaper crashes when I use SWS/BR: Toggle preview take under mouse through track, and switch to a different project tab while the preview is in progress. 100% repro rate.

[cfillion]

EDIT: It's crashing because we're deleting the preview's audio source after failing to stop the preview in the new project. Fixing...

EDIT2: I've uploaded a test build at https://cfillion.ca/files/sws/fix-track-preview-stop-project-change/.