Marks this as transient for the surface to which the given parent_handle_str refers.
Typically, the handle will originate from a [[email protected]_handle] call in another process.
Note that this API depends on an unstable Wayland protocol, and thus may require changes in the future.
| this |
the `GdkToplevel` to make as transient |
| parent_handle_str |
an exported handle for a surface |
|
true if the surface has been marked as transient, false if an error occurred. |