Implement LineNumberArea to display line numbers, based on the Code
Editor Example documentation. Introduce QListView with ErrorListModel
to show errors and warnings. Double-clicking an error in the list moves
the code editor's cursor to the corresponding position.
Update shortcut functionality to work only on platforms where the
feature is available. Related code has been modified accordingly.
Fixes: QTBUG-128227
Pick-to: 6.8
Change-Id: Icb66280a5360b015280afc756f8a827247a2ebaf
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
MohammadHossein Qanbari