I suggest to have a option for the loading bar to "loop":
Example of "looping"
Would be happy to play around with this and possibly issue a pull request, if no one is interested to implement. But this could be a good task for beginners as well.
Would be a great alternative to the circle spinner when actual progress is unknown (e.g. waiting for something to complete that doesn't provide any progress).
Description
I suggest to have a option for the loading bar to "loop":
Example of "looping"
Would be happy to play around with this and possibly issue a pull request, if no one is interested to implement. But this could be a good task for beginners as well.