Cancel downloads in progress when threads removed #41
Description
New download managers from bugfix/imagelink-download-duplicates-raceconditions-threadsafety branch will allow cancellation of downloads in progress, and stopping future downloads too.
A few things are needed:
- Need to use a download technique that supports cancellation. Probably need to swap to using HttpClient.
- Will also need to adjust all download exception handling.
- When user changes "SaveHTML" setting, cancel thread html downloads if false.
- When a thread is removed, cancel image downloads and cancel html download.
- Cancel when user initiates removal, so no more exceptions happen regarding renaming folders.
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