sidebar: add calendar popover natural width

src/gui/gcal-calendar-button.c

@@ -96,6 +96,7 @@ create_row_func (gpointer data,
   label = gtk_label_new (gcal_calendar_get_name (calendar));
   gtk_label_set_xalign (GTK_LABEL (label), 0.0);
   gtk_label_set_ellipsize (GTK_LABEL (label), PANGO_ELLIPSIZE_END);
+  gtk_widget_set_tooltip_text (label, gcal_calendar_get_name (calendar));
   gtk_widget_set_hexpand (label, TRUE);
 
   /* checkbox */

src/gui/gcal-calendar-button.ui

@@ -55,7 +55,13 @@
           <object class="GtkScrolledWindow">
             <property name="hscrollbar_policy">never</property>
             <property name="max_content_height">450</property>
+            <property name="max_content_width">800</property>
             <property name="propagate-natural-height">True</property>
+            <property name="propagate-natural-width">True</property>
+            <child>
+              <object class="AdwClamp">
+                <property name="maximum-size">800</property>
+                <property name="tightening-threshold">800</property>
                 <child>
                   <object class="GtkListBox" id="calendar_listbox">
                     <property name="hexpand">True</property>
@@ -68,7 +74,8 @@
                 </child>
               </object>
             </child>
-
+          </object>
+        </child>
       </object>
     </child>
   </object>