Prework

• Read and agree to the code of conduct and contributing guidelines.
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Description

Shows up in complicated cases when a pattern is up to date but is temporarily considered "running" until all the branches are checked. Should handle with a new target_patternview_running() method that calls patternview_register_running() on the parent in a branch (and does nothing in all other target classes). target_patternview_running() should be called in target_prepare.tar_builder(). We can then remove patternview_register_running() from pattern_conclude_initial() and progress monitoring should be the same as before (except not over eager).