Properly show feature count in attribute table title
Total # of features
Filtered features
Selected features
Attribute table selection: performance improvements
When selecting features with the mouse (click and drag) only redraw
the map canvas, once the mouse is released.
Attribute editor, form view: Change selection behavior
Text background is now used for the current edit selection
The icon shows the feature selection state
[FIX #7529] Attribute table: Crash when changing column filter
When using the field calculator and afterwards changing the column filter
resulted in a crash
[FIX #7530] Attribute table: Edited feature not updated in single row
If only a single row was shown, the outdated cached feature would be shown even
when the attribute behind it was edited.
[FIX #7543] Dual View Table/Form: Preview column not saved in project
Merge pull request #508 from matthias-kuhn/dual-view-fixes

Dual view fixes