Hi,
In Gtk3, GtkStackSwitcher inherits GtkBox which has a homogeneous property. In Gtk4, GtkStackSwitcher inherits GtkWidget directly and lose this property. Evince use this property to implement its sidebar. And the general question is how do I set properties (such like hexpand halign) for GtkButton managed by GtkStackSwitcher.
Thanks
how do I set properties (such like hexpand halign) for GtkButton managed by GtkStackSwitcher.
You can’t. Even in GTK3 those buttons were an implementation detail and not a part of the API - in other words if the internal layout changes and your app breaks, it’s your fault. 
You can still get them via gtk_widget_get_first_child() etc, but don’t.
Evince use this property to implement its sidebar.
What are you trying to achieve? If you’re trying to get a switcher to expand, I think it would make sense to do that unconditionally in GtkStackSwitcher itself, so that halign=fill actually works.
I’m trying to port Evince to GTK4. And Evince use the homogeneous property to make the buttons in sidebar look like this:
But even with halign set to fill, GtkStackSwitcher still look like this with GTK4:
The horizontal space is filled by GtkStackSwitcher already according to GTK inspector.
Right, hence as I said it needs to be fixed in GTK. No need for new API or peeking into inner widgets.
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