* Core: Fix completer popup adjustment after 'Tab' pressing
Completer popup in Expression Editor is now positioned and sized after pressing 'Tab'. This was missing when feature was added.
* Core: Extend completer popup list to up 20 elements or up to screen edge
Completer popup will now show up to 20 elements or will be limited to screen edge; if limited < 3 rows, popup will be displayed over cursor.
* Core: Fix completer wrapping on secondary screens
* Core: Fix completer positioning when includes long entries
* Core: Fix linter complaints
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