This commit fixes the following errors:
- "<Unknown File>: Can't assign to existing role 'value' of different
type [VariantMap -> String]" which occurs whenever the metadata view is
enabled and appears if at least one of the metadata keys has an empty
value;
- "Unable to assign [undefined] to QString" which occurs whenever the
search bar is cleared.
This commit addresses warnings that were raised by QtCreator's linter:
- IDs declared more than once
- variables declared more than once in the same scope
- type coercions
- variables declared as "var" when their type is known
- unclosed "case" in switch-case
* use it in MetadataListView and GraphEditor 'add Node' menu
* GraphEditor: forward MenuItem key events to searchBar to be able to continue editing the filter even if it lost active focus
* bugfix: in latest PySide2 versions, application palette is not properly applied to all QtQuick Controls 2 components. Force this by exposing QApplication palette and bind it to the root ApplicationWindow.
* rename all "palette" ids to "activePalette" to avoid clashes with "palette" property on QtQuick Controls 2
* use parent component palette when it makes sense to propagate active/disabled style (instead of always using Active SystemPalette)
* display selectable-by-mouse source filepath
* add radius property to FloatingPane to control border radius from outside
* use FloatingPane in ImageMetadataView
* use variant for filterValue and implement different logics to test filter matching based on value type
* allow redefinition of modelData and respectFilter functions to customize logic from outisde if need be
* add convenient 'reverseSortOrder' method
