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overlay: Clarify pass-through docs

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Explain that widgets with their own windows need to
have gdk_window_set_pass_through called on them.

Fixes: #3861
This commit is contained in:
Matthias Clasen 2021-04-16 11:14:18 -04:00
parent a1aa4a970d
commit 3aa742d715
1 changed files with 5 additions and 0 deletions
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5
gtk/gtkoverlay.c
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@ -777,6 +777,11 @@ gtk_overlay_class_init (GtkOverlayClass *klass)
* Whether to pass input through the overlay child to the main child.
* (Of course, this has no effect when set on the main child itself.)
*
* Note that this is implemented by calling gdk_window_set_pass_through()
* on the window that the overlay child is placed in. If the descendents
* of the overlay child have their own windows, you need to manually call
* that function on them to achieve the desired effect.
*
* Since: 3.18
*/
gtk_container_class_install_child_property (container_class, CHILD_PROP_PASS_THROUGH,