Progress for AppImage partial download is not working

[peter-sanderson]

HI, I create this issue to summarize all the stuff I know of an make it clear.

The problem is, that with AppImage the differential download can be used (any by default is is used). This method does NOT heave implemented the logic for emitting progress events in case when it uses multi-part single request (see here).

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It seems to me that solution is to pass downloadInfoTransform down the line into the multipleRangeDownloader and its doExecuteTasks function.

Here is PR just for demonstrative purpose. Here is the draft PR: #8697 Its is just an illustrative example.

I lack the knowledge to complete this PR.

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Originally I was solving this in this issue #8659 but I think after I dig into it and found the real root cause, it shall have its own.

This is list of issues I believe have the same root cause:

• download-progress event not firing #8659 (already mentioned above)
• download-progress and update-downloaded events not firing with Electron 12 #5800 (closed as stalled)