utils: Rename DummyObject to PlaceholderObject

"dummy" can be viewed as offensive

src/session/view/account_settings/notifications_page.rs

@@ -8,7 +8,7 @@ use crate::{
     i18n::gettext_f,
     session::model::{NotificationsGlobalSetting, NotificationsSettings},
     spawn, toast,
-    utils::{BoundObjectWeakRef, DummyObject, SingleItemListModel},
+    utils::{BoundObjectWeakRef, PlaceholderObject, SingleItemListModel},
 };
 
 mod imp {
@@ -123,7 +123,7 @@ mod imp {
                     ],
                 );
 
-                let extra_items = SingleItemListModel::new(&DummyObject::new("add"));
+                let extra_items = SingleItemListModel::new(&PlaceholderObject::new("add"));
 
                 let all_items = gio::ListStore::new::<glib::Object>();
                 all_items.append(&settings.keywords_list());

src/session/view/content/room_details/addresses_subpage/mod.rs

@@ -14,7 +14,7 @@ use crate::{
     prelude::*,
     session::model::{AddAltAliasError, RegisterLocalAliasError, Room},
     spawn, toast,
-    utils::{DummyObject, SingleItemListModel},
+    utils::{PlaceholderObject, SingleItemListModel},
 };
 
 mod imp {
@@ -83,7 +83,7 @@ mod imp {
         fn constructed(&self) {
             self.parent_constructed();
 
-            let add_item = SingleItemListModel::new(&DummyObject::new("add"));
+            let add_item = SingleItemListModel::new(&PlaceholderObject::new("add"));
 
             // Public addresses.
             let public_items = gio::ListStore::new::<glib::Object>();

src/utils/mod.rs

@@ -18,15 +18,16 @@ use gtk::{gio, glib, prelude::*};
 use regex::Regex;
 use tempfile::NamedTempFile;
 
-mod dummy_object;
 pub(crate) mod expression;
 mod expression_list_model;
+mod grouping_list_model;
 pub(crate) mod key_bindings;
 mod location;
 mod macros;
 pub(crate) mod matrix;
 pub(crate) mod media;
 pub(crate) mod notifications;
+mod placeholder_object;
 mod single_item_list_model;
 pub(crate) mod sourceview;
 pub(crate) mod string;
@@ -34,9 +35,9 @@ mod template_callbacks;
 pub(crate) mod toast;
 
 pub(crate) use self::{
-    dummy_object::DummyObject,
     expression_list_model::ExpressionListModel,
     location::{Location, LocationError, LocationExt},
+    placeholder_object::PlaceholderObject,
     single_item_list_model::SingleItemListModel,
     template_callbacks::TemplateCallbacks,
 };

src/utils/placeholder_object.rs

@@ -6,31 +6,32 @@ mod imp {
     use super::*;
 
     #[derive(Debug, Default, glib::Properties)]
-    #[properties(wrapper_type = super::DummyObject)]
-    pub struct DummyObject {
+    #[properties(wrapper_type = super::PlaceholderObject)]
+    pub struct PlaceholderObject {
         /// The identifier of this item.
         #[property(get, set)]
         id: RefCell<String>,
     }
 
     #[glib::object_subclass]
-    impl ObjectSubclass for DummyObject {
-        const NAME: &'static str = "DummyObject";
-        type Type = super::DummyObject;
+    impl ObjectSubclass for PlaceholderObject {
+        const NAME: &'static str = "PlaceholderObject";
+        type Type = super::PlaceholderObject;
     }
 
     #[glib::derived_properties]
-    impl ObjectImpl for DummyObject {}
+    impl ObjectImpl for PlaceholderObject {}
 }
 
 glib::wrapper! {
-    /// A dummy GObject.
+    /// A GObject to use as a placeholder.
     ///
-    /// It can be used for example to add extra widgets in a list model and can be identified with its ID.
-    pub struct DummyObject(ObjectSubclass<imp::DummyObject>);
+    /// It can be used for example to add extra widgets in a list model and can
+    /// be identified with its ID.
+    pub struct PlaceholderObject(ObjectSubclass<imp::PlaceholderObject>);
 }
 
-impl DummyObject {
+impl PlaceholderObject {
     pub fn new(id: &str) -> Self {
         glib::Object::builder().property("id", id).build()
     }