The progressbar used by IDEA does not seem to be part of the openapi (hope I'm not wrong, I have looked everywhere for it). So people using the openapi for a plugin that does some processing are left with only two options:
- do not provide feedback at all on how things are going (pretty easy to do that)
- use the progressbar provided by java (but this does not look quite the same as the IDEA one)
There would be a third option: someone really stubborn could decompile the idea classes (yes, I know they are obfuscated), get the class doing the progress and integrate it in their plugin. I don't know how happy IDEA people would be about that though (there are probably some leagal issuses as well).