project: Remove most can-focus properties

In GTK4, can-focus usage is much more specific to widget subclasses,
and in almost all cases it's not necessary to set it.

Remove it everywhere, except in one case where it still needs to be
manually set to False.

libmalcontent-ui/user-controls.ui

@@ -36,7 +36,6 @@
                 <property name="subtitle_lines">0</property>
                 <child>
                   <object class="GtkSwitch" id="restrict_web_browsers_switch">
-                    <property name="can_focus">True</property>
                     <property name="halign">end</property>
                     <property name="valign">center</property>
                     <signal name="notify::active" handler="on_restrict_web_browsers_switch_active_changed_cb" object="MctUserControls" swapped="no" />
@@ -85,7 +84,6 @@
                 <property name="subtitle_lines">0</property>
                 <child>
                   <object class="GtkSwitch" id="restrict_software_installation_switch">
-                    <property name="can_focus">True</property>
                     <property name="halign">end</property>
                     <property name="valign">center</property>
                     <signal name="notify::active" handler="on_restrict_installation_switch_active_changed_cb" object="MctUserControls" swapped="no" />
@@ -106,7 +104,6 @@
                 <property name="subtitle_lines">0</property>
                 <child>
                   <object class="GtkMenuButton" id="oars_button">
-                    <property name="can_focus">True</property>
                     <property name="halign">end</property>
                     <property name="valign">center</property>
                     <property name="direction">right</property>

malcontent-control/application.c

@@ -427,12 +427,7 @@ update_main_stack (MctApplication *self)
   gtk_stack_set_visible_child_name (self->main_stack, new_page_name);
 
   if (new_focus_widget != NULL && !g_str_equal (old_page_name, new_page_name))
-    {
+    gtk_widget_grab_focus (new_focus_widget);
-      if (gtk_widget_get_can_focus (new_focus_widget))
-        gtk_widget_grab_focus (new_focus_widget);
-      else
-        gtk_widget_child_focus (new_focus_widget, GTK_DIR_TAB_FORWARD);
-    }
 }
 
 static void

malcontent-control/carousel.ui

@@ -28,14 +28,12 @@
                 <child>
                   <object class="GtkButton" id="go_back_button">
                     <property name="visible">False</property>
-                    <property name="can_focus">True</property>
                     <property name="valign">center</property>
                     <style>
                       <class name="circular"/>
                     </style>
                     <child>
                       <object class="GtkImage">
-                        <property name="can_focus">False</property>
                         <property name="icon-size">4</property>
                         <property name="icon_name">go-previous-symbolic</property>
                         <child internal-child="accessible">
@@ -53,14 +51,12 @@
                 </child>
                 <child>
                   <object class="GtkButton" id="go_next_button">
-                    <property name="can_focus">True</property>
                     <property name="valign">center</property>
                     <style>
                       <class name="circular"/>
                     </style>
                     <child>
                       <object class="GtkImage">
-                        <property name="can_focus">False</property>
                         <property name="icon-size">4</property>
                         <property name="icon_name">go-next-symbolic</property>
                         <child internal-child="accessible">
@@ -80,6 +76,7 @@
             </child>
             <child type="overlay">
               <object class="GtkBox">
+                <property name="can-focus">False</property>
                 <property name="valign">GTK_ALIGN_END</property>
                 <style>
                   <class name="carousel-arrow-container"/>

malcontent-control/main.ui

@@ -16,7 +16,6 @@
             <child>
               <object class="GtkMenuButton" id="primary_menu">
                 <property name="direction">none</property>
-                <property name="can-focus">True</property>
                 <property name="use-popover">True</property>
                 <property name="menu-model">primary-menu</property>
                 <accelerator key="F10" signal="activate"/>
@@ -76,7 +75,6 @@
                     <property name="halign">center</property>
                     <property name="can-default">True</property>
                     <property name="has-default">True</property>
-                    <property name="can-focus">True</property>
                   </object>
                 </child>
               </object>
@@ -98,7 +96,6 @@
                     <property name="can-default">True</property>
                     <property name="has-default">True</property>
                     <property name="use-underline">True</property>
-                    <property name="can-focus">True</property>
                     <style>
                       <class name="suggested-action"/>
                     </style>