API for adding a css class name to GtkTooltip window
App developer requirement:
I want for my app to show some tooltips in a red background, while others in yellow or default style.
Current situation:
I can define those different styles as css classes, but I cannot add a class name to the GtkTooltip window.
I think it's ok that GTK4 does not give access to GtkTooltipWindow, but at least provide api to add/remove css classes from it.
Edited by Nelson Ben