fix (simpler) - cursor whenever changing editors - closes #2688 #3103
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What this PR does / why we need it:
ModeHandler.syncCursors() and updateView() stopped being called on active editor changes after the bugfix to EditorIdentity because a window change wasn't being detected as a window change when the filename-only identity is identical :D.
getAndUpdateModeHandler() is called in a ton of places, so this PR adds a force-sync option, and has the ActiveEditorChange handler use it.
Which issue(s) this PR fixes
#2688
Special notes for your reviewer:
This PR restores the behavior to how it was before.
I took a wrong turn on another PR, but because of that, I noticed that there's some differences between selection change handling and editor switches. It's pretty clear from just the length of it ;), but for example, EOL-checking seems to behave slightly different when switching editors than when staying in the same editor. It's probably outside the scope of this issue, but I thought I'd mention it.