Allow specifying WindowDrawnDecoration Theme from toplevel (e.g. Window)

[rabbitism]

Is your feature request related to a problem? Please describe.

A common scenario is to have different Window subclasses with different decorations. TopLevel should expose a property like DecorationTheme property and apply to TopLevelHost when decoration is created.

Describe the solution you'd like

Describe alternatives you've considered

No response

Additional context

No response

[kekekeks]

Window is the logical parent of TopLevelHost, so simply adding the ControlTheme to Window.Resources should work

[rabbitism]

Window is the logical parent of TopLevelHost, so simply adding the ControlTheme to Window.Resources should work

Just checked, this resource cannot be carried by a Window theme, default decoration theme has higher priority. Only resource defined in Window definition is applicable. this is horrible for control libraries.