`--stdout-progress` missing newline character when doing partial extraction

[Samueru-sama]

as seen in AppImage/AppImageSpec#36 (comment) here:

here is a test with dwarfsextract directly:

[mhx]

It's even worse, as you can probably tell by the fact that it will hardly ever get close to 100%. :)

If you're only extracting a subset of the contents, it won't currently consider the total size of this subset, but the percentage will be relative to the total size of the whole file system. And the newline is only emitted once it reaches 100%.

Since I'll have to do a separate walk in preparation of subset-extraction anyway, I can use that walk to accumulate the total subset size, which should fix this issue.

[Samueru-sama]

Note I don't mind the 0%, it even kinda tells the user that we are not extracting the whole thing.

[mhx]

Note I don't mind the 0%, it even kinda tells the user that we are not extracting the whole thing.

I definitely do mind progress bars that behave erratically. This isn't Windows. :p

[mhx]

Really big thanks for reporting this.

I've found a whole bunch of subtle issues while fixing this and adding more test cases in the process.