There were 3 different random numbers set to determine the sidebar width
and all of them were wrong. Remove them.
Instead, propagate the natural width of the listitems.
<object class="GtkBox">
<child>
<object class="GtkBox">
- <property name="width-request">220</property>
<property name="orientation">vertical</property>
<child>
<object class="GtkSearchBar" id="searchbar">
<style>
<class name="sidebar"/>
</style>
- <property name="width-request">120</property>
<property name="hscrollbar-policy">never</property>
- <property name="min-content-width">150</property>
+ <property name="propagate-natural-width">1</property>
<property name="vexpand">1</property>
<child>
<object class="GtkListView" id="listview">