"right-of-center" alignment

[kinten108101]

Currently, the omni bar and the run button are grouped into one GtkBox. This, however, means that the omni bar will not be centered to the window's axis.

In GNOME Builder, a custom child type was implemented to solve this issue. This child type, right-of-center, is defined in a template header bar class. We should do the same.

Other solutions are welcomed.

Acceptance criteria

• Get the omnibar to be centered and other components stick to its sides

Progress

I found out that we can use GtkCenterBox. However, I can't use the center-widget, end-widget, and start-widget props in Blueprint. The doc doesn't mention anything deprecated. I don't know if this is Blueprint's fault or if I'm using the props wrong.

After some digging, I found a workaround. The doc mentioned two way of setting widgets to these positions.

a. Use the method Gtk.CenterBox.set_center_widget etc
b. Assign widget to the center-widget property
c. Set child with type center-wigdet etc, via GtkBuildable

I want the creation of static UI components to be decoupled from app logic so I avoided a. I chose method b but did not work. I forgot method c, and so far it worked.

This is weird. I've always assumed that you can assign things to a property both in UI template and in code.