image_window: Disable more buttons on error pages

Closes #436

src/widgets/image_view.rs

@@ -891,6 +891,10 @@ impl LpImageView {
         self.imp().zoom_menu_button.clone()
     }
 
+    pub fn zoom_toggle(&self) -> gtk::ToggleButton {
+        self.imp().zoom_toggle.clone()
+    }
+
     pub fn zoom_value_f64(&self) -> Option<f64> {
         let mut value = self.imp().zoom_value.text().to_string();
         let locale_settings = util::locale_settings();

src/widgets/image_window.rs

@@ -757,6 +757,12 @@ impl LpImageWindow {
                 .is_some_and(|image| !image.is_best_fit()),
         );
 
+        self.image_view().zoom_toggle().set_sensitive(enabled_shown);
+
+        self.image_view()
+            .zoom_menu_button()
+            .set_sensitive(enabled_shown);
+
         // Actions that are available if there is an current image, even if it's not
         // shown
         const ACTIONS_CURRENT: &[Action] = &[
@@ -774,7 +780,8 @@ impl LpImageWindow {
         }
 
         // Editing related actions
-        let enable_editing = self
+        let enable_editing = enabled_shown
+            && self
                 .imp()
                 .image_view
                 .current_image()

src/widgets/image_window.ui

@@ -126,7 +126,7 @@
                   </object>
                 </child>
                 <child type="end">
-                  <object class="GtkButton" id="edit_button">
+                  <object class="GtkButton">
                     <property name="action-name">win.edit</property>
                     <property name="icon-name">crop-symbolic</property>
                     <property name="tooltip-text" translatable="yes">Edit Image</property>