cmd/govim: safely handle busy state changes for non-.go buffers #823
+69
−30
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In 8926dec we backed out the changes for tracking all buffer changes.
But in so doing we didn't properly handle the situation where the busy
state changes and the cursor is in a non-go file.
Fix that and add a test to verify we don't regress.
Whilst we are at it:
position
Fixes #821