Support GNOME Titlebar Shade Action

[MrUrdam]

In GNOME using the GNOME Tweaks extension ist is easily possible to define the so called Shade Action to a Titlebar Action (Double Click, Middle Click etc.)

By default a application will then minimize into its titlebar. So the titlebar itself stays visible but the windows content is invisible.

When using the custom window decorations in flatlaf this GNOME option is not taken into account. On a double click the application keeps toggeling between fullscreen and windowed.

Would it even be possible to collapse into the Java embedded Titlebar?

Best regards

Andre