Material controls are not highlighted properly when focused

Material controls (e.g. Button) should use "Primary" color to highlight when focused, now they only dimm the color a little bit.

On Android the focused controls are highlighted using the "Primary" color.
IMHO you should automatically bind the highlighted property to focus property (at least) on Android.

If you don't want to change it by default, at least add another property to "qtlabscontrols.conf" which we can use to turn on this feature.

:/qtlabscontrols.conf
[Controls]
Style=Material

[Material]
Theme=Dark
Accent=Teal
Primary=BlueGrey