[git] more diagnostics for the problem when change is not found for file
Plain completion contributor: better api

use a boolean key to indicate plain prefix matcher need.
WEB-12614 Emmet Filters
NodeJS 138.921 / Ruby 7.0.0.20140704, Kotlin 0.7.X / 0.8.7 marked as incompatible
detect if restart required
find actions: sort actions by visibility [^zolotov]