in smaller amounts
Default Qt behavior is to increase step size 10x when ctrl
is held while mouse wheel - but everywhere else in QGIS
UI we use the ctrl modifier as a "finer" increment with
the mouse wheel (e.g. ctrl+wheel = fine zoom into map/composer).
So override Qt's behavior and instead make ctrl modifier result
in 1/10th usual increment for spin boxes.
This was causing an issue if you tried to access widgets in a form using findChildren
widgets could not be casted to QGIs native types
also sipify QgsFilterLineEdit and QgsRelationEditorWidget
Fixes issues with the current approach:
- poor appearance on certain environments (esp OSX)
- large area on spin boxes' right which "swallows" clicks
and blocks interactivity
Fix#12920
Rationale:
- there was a lot of large objects passed by value, so potentially
there's a speed bump from this
- even for implicitly shared classes like QString/QList there's still
a (small) cost for copying the objects when there's no reason to
- it's the right thing to do!
