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The Indexing... progress task is displayed in indeterminate mode. But at least in the case of indexing a JAR file, you should have a good idea of how long it will take - just assume every .class file takes the same amount of time. For folders it may need to be indeterminate.
Task should also give progress updates about what, exactly, it is indexing - at least to the package level. Same for "Compiling..." task.
In fact this is regression against 5.5
It's not so easy the RepositoryUpdater works as s sliding task. When events comes from GPR it buffers it. So it does not know how many roots it will be scanning since new events may come even the scanning is already in progress. But should be doable into M8.
Not really a P3.
Obsolete milestone, please reevaluate
Reassigning all moonko's java/source bugs to myself.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss