Caching file encodings in PBXReference

don't even look for class in on-demand imports when named import matches

When vcs mappings are changed on disk, ProjectLevelVcsManager.readDirectoryMappings first clears the old mappings completely. This triggers VCS_CONFIGURATION_CHANGED event. Then new mappings are set, which triggers the event again. So recreateLog is called twice, the first time it just disposes the old log, the second it should create a new one.

The issue was that the callback creating a new log was only called if an old log was present (after disposing it). Which led to new log not being created. Fix is to always invoke the callback.

This change should fix EA-68501, EA-97181 and IDEA-190205.

Alexey Ushakov

Since revision 3aa11a56, Edit Source action from Changes Browser is registered via xml file. So it started to be active when there are changes in context. This led for this action to be executed from file history by f4 shortcut instead of Open Repository Version (IDEA-180371). Open Repository Version action inherited icon and shortcut from Edit Source, which is weird since it is a separate action and the two can appear in the same context simultaneously, so it was changed in 52f1c1ee. All this led to IDEA-190169 issue: Edit Source is always invoked by f4 even when user wants to assign f4 to Open Repository Version. Solution of the problem is to restrict EditSourceFromChangesBrowserAction to Changes Browser.

Sometimes activation function can be called, when matplotlib module isn't fully imported. Do not remove activation function until the module is imported properly.

Continued, part 2

* AnAction is not Comparable, so it should be wrapped before processing

fixes WEB-32290 as a side-effect

IDEA-CR-31776