Expose FileSystemDock to the scripting API and fixed signals

Fixed FileSystemDock's `file_removed` and `folder_removed` signals not being
emitted because the emitted was using the wrong signal name.

(cherry picked from commit fe0b783e707198fbe64abda795ad234999f87834)

editor/editor_node.cpp

@@ -3673,6 +3673,7 @@ void EditorNode::register_editor_types() {
 	ClassDB::register_class<ScriptCreateDialog>();
 	ClassDB::register_class<EditorFeatureProfile>();
 	ClassDB::register_class<EditorSpinSlider>();
+	ClassDB::register_virtual_class<FileSystemDock>();
 
 	// FIXME: Is this stuff obsolete, or should it be ported to new APIs?
 	ClassDB::register_class<EditorScenePostImport>();

editor/editor_plugin.cpp

@@ -227,6 +227,10 @@ EditorFileSystem *EditorInterface::get_resource_file_system() {
 	return EditorFileSystem::get_singleton();
 }
 
+FileSystemDock *EditorInterface::get_file_system_dock() {
+	return EditorNode::get_singleton()->get_filesystem_dock();
+}
+
 EditorSelection *EditorInterface::get_selection() {
 	return EditorNode::get_singleton()->get_editor_selection();
 }
@@ -296,6 +300,7 @@ void EditorInterface::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("select_file", "file"), &EditorInterface::select_file);
 	ClassDB::bind_method(D_METHOD("get_selected_path"), &EditorInterface::get_selected_path);
 	ClassDB::bind_method(D_METHOD("get_current_path"), &EditorInterface::get_current_path);
+	ClassDB::bind_method(D_METHOD("get_file_system_dock"), &EditorInterface::get_file_system_dock);
 
 	ClassDB::bind_method(D_METHOD("set_plugin_enabled", "plugin", "enabled"), &EditorInterface::set_plugin_enabled);
 	ClassDB::bind_method(D_METHOD("is_plugin_enabled", "plugin"), &EditorInterface::is_plugin_enabled);

editor/editor_plugin.h

@@ -53,6 +53,7 @@ class EditorSpatialGizmoPlugin;
 class EditorResourcePreview;
 class EditorFileSystem;
 class EditorToolAddons;
+class FileSystemDock;
 class ScriptEditor;
 
 class EditorInterface : public Node {
@@ -88,6 +89,8 @@ public:
 	EditorResourcePreview *get_resource_previewer();
 	EditorFileSystem *get_resource_file_system();
 
+	FileSystemDock *get_file_system_dock();
+
 	Control *get_base_control();
 
 	void set_plugin_enabled(const String &p_plugin, bool p_enabled);

editor/filesystem_dock.cpp

@@ -1287,12 +1287,12 @@ void FileSystemDock::_make_scene_confirm() {
 	editor->get_editor_data().set_scene_path(idx, scene_name);
 }
 
-void FileSystemDock::_file_deleted(String p_file) {
-	emit_signal("file_deleted", p_file);
+void FileSystemDock::_file_removed(String p_file) {
+	emit_signal("file_removed", p_file);
 }
 
-void FileSystemDock::_folder_deleted(String p_folder) {
-	emit_signal("folder_deleted", p_folder);
+void FileSystemDock::_folder_removed(String p_folder) {
+	emit_signal("folder_removed", p_folder);
 }
 
 void FileSystemDock::_rename_operation_confirm() {
@@ -2470,8 +2470,8 @@ void FileSystemDock::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_file_list_rmb_pressed"), &FileSystemDock::_file_list_rmb_pressed);
 	ClassDB::bind_method(D_METHOD("_tree_rmb_empty"), &FileSystemDock::_tree_rmb_empty);
 
-	ClassDB::bind_method(D_METHOD("_file_deleted"), &FileSystemDock::_file_deleted);
-	ClassDB::bind_method(D_METHOD("_folder_deleted"), &FileSystemDock::_folder_deleted);
+	ClassDB::bind_method(D_METHOD("_file_removed"), &FileSystemDock::_file_removed);
+	ClassDB::bind_method(D_METHOD("_folder_removed"), &FileSystemDock::_folder_removed);
 
 	ClassDB::bind_method(D_METHOD("_file_list_thumbnail_done"), &FileSystemDock::_file_list_thumbnail_done);
 	ClassDB::bind_method(D_METHOD("_tree_thumbnail_done"), &FileSystemDock::_tree_thumbnail_done);
@@ -2651,8 +2651,8 @@ FileSystemDock::FileSystemDock(EditorNode *p_editor) {
 	add_child(owners_editor);
 
 	remove_dialog = memnew(DependencyRemoveDialog);
-	remove_dialog->connect("file_removed", this, "_file_deleted");
-	remove_dialog->connect("folder_removed", this, "_folder_deleted");
+	remove_dialog->connect("file_removed", this, "_file_removed");
+	remove_dialog->connect("folder_removed", this, "_folder_removed");
 	add_child(remove_dialog);
 
 	move_dialog = memnew(EditorDirDialog);

editor/filesystem_dock.h

@@ -210,8 +210,8 @@ private:
 	void _update_favorites_list_after_move(const Map<String, String> &p_files_renames, const Map<String, String> &p_folders_renames) const;
 	void _update_project_settings_after_move(const Map<String, String> &p_renames) const;
 
-	void _file_deleted(String p_file);
-	void _folder_deleted(String p_folder);
+	void _file_removed(String p_file);
+	void _folder_removed(String p_folder);
 	void _files_moved(String p_old_file, String p_new_file);
 	void _folder_moved(String p_old_folder, String p_new_folder);