ok - here's a final test result - no picture upload this tiem as they all look the same !
i usedanother retail epub - ruth rendell, not in calibre
1. i opened the style sheet as a tab in the main display- then i selected praise in the right hand toc which opens that page in the main tabs pane. i then deleted the matching html - saved. OK
2. I selected also by... and did the same sequence -, delete file, save , OK
3. thinking OK, there shoudl now be some unused styles I ran delete unused styles , okayed the results, clicked save - crash
so it is looking like all you have to do is to force a situation where there will be some unused styles, ( by removing some pages) show the stylesheet, run the clean up and save...
over to others to see if they can force a similar crash
i am not even convince that the sylesheet has to be the front tab - it has to be open, and some styles have to have been deleted, and the next command has to be save... that's what I think are a trigger-set.
Last edited by stumped; 06-10-2017 at 11:55 AM.
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