Benjamin Otte b14a115fc0 container: Implement get_opaque_rect() ...

We find the first child that covers >80% of the container and return
that.

This is a nice speedup for the common case of a GtkWindow being covered
by a large opaque background.
It will fall apart for fancy themes that play with transparency or for
small windows because the shadow region gets too large.

But then we just scan the whole node tree.

We could think about adapting the 80% number, because that wasn't chosen
with any real scientific data behind it.

2024-07-08 15:28:14 +02:00

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