Improve sorting options in the asset library

The reverse sorting options are now integrated in the list of
sorting options, making the "Reverse" button unnecessary.
This pattern tends to be easier to discover by users.

The "Downloads" sorting option was also removed as it's not
implemented in the backend.

editor/plugins/asset_library_editor_plugin.cpp

@@ -578,7 +578,6 @@ void EditorAssetLibrary::_notification(int p_what) {
 		case NOTIFICATION_READY: {
 
 			error_tr->set_texture(get_icon("Error", "EditorIcons"));
-			reverse->set_icon(get_icon("Sort", "EditorIcons"));
 			filter->set_right_icon(get_icon("Search", "EditorIcons"));
 			filter->set_clear_button_enabled(true);
 
@@ -612,7 +611,6 @@ void EditorAssetLibrary::_notification(int p_what) {
 			library_scroll_bg->add_style_override("panel", get_stylebox("bg", "Tree"));
 			downloads_scroll->add_style_override("bg", get_stylebox("bg", "Tree"));
 			error_tr->set_texture(get_icon("Error", "EditorIcons"));
-			reverse->set_icon(get_icon("Sort", "EditorIcons"));
 			filter->set_right_icon(get_icon("Search", "EditorIcons"));
 			filter->set_clear_button_enabled(true);
 		} break;
@@ -645,23 +643,27 @@ void EditorAssetLibrary::_install_asset() {
 }
 
 const char *EditorAssetLibrary::sort_key[SORT_MAX] = {
-	"downloads",
+	"updated",
+	"updated",
 	"name",
+	"name",
+	"cost",
 	"cost",
-	"updated"
 };
 
 const char *EditorAssetLibrary::sort_text[SORT_MAX] = {
-	"Downloads",
-	"Name",
-	"License", // "cost" stores the SPDX license name in the Godot Asset Library.
-	"Updated"
+	"Recently Updated",
+	"Least Recently Updated",
+	"Name (A-Z)",
+	"Name (Z-A)",
+	"License (A-Z)", // "cost" stores the SPDX license name in the Godot Asset Library.
+	"License (Z-A)", // "cost" stores the SPDX license name in the Godot Asset Library.
 };
 
 const char *EditorAssetLibrary::support_key[SUPPORT_MAX] = {
 	"official",
 	"community",
-	"testing"
+	"testing",
 };
 
 void EditorAssetLibrary::_select_author(int p_id) {
@@ -928,8 +930,8 @@ void EditorAssetLibrary::_search(int p_page) {
 		args += "&category=" + itos(categories->get_item_metadata(categories->get_selected()));
 	}
 
-	if (reverse->is_pressed()) {
-
+	// Sorting options with an odd index are always the reverse of the previous one
+	if (sort->get_selected() % 2 == 1) {
 		args += "&reverse=true";
 	}
 
@@ -1381,12 +1383,6 @@ EditorAssetLibrary::EditorAssetLibrary(bool p_templates_only) {
 	sort->set_h_size_flags(SIZE_EXPAND_FILL);
 	sort->connect("item_selected", this, "_rerun_search");
 
-	reverse = memnew(ToolButton);
-	reverse->set_toggle_mode(true);
-	reverse->connect("toggled", this, "_rerun_search");
-	reverse->set_tooltip(TTR("Reverse sorting."));
-	search_hb2->add_child(reverse);
-
 	search_hb2->add_child(memnew(VSeparator));
 
 	search_hb2->add_child(memnew(Label(TTR("Category:") + " ")));

editor/plugins/asset_library_editor_plugin.h

@@ -190,7 +190,6 @@ class EditorAssetLibrary : public PanelContainer {
 	OptionButton *categories;
 	OptionButton *repository;
 	OptionButton *sort;
-	ToolButton *reverse;
 	Button *search;
 	HBoxContainer *error_hb;
 	TextureRect *error_tr;
@@ -216,10 +215,12 @@ class EditorAssetLibrary : public PanelContainer {
 	};
 
 	enum SortOrder {
-		SORT_DOWNLOADS,
+		SORT_UPDATED,
+		SORT_UPDATED_REVERSE,
 		SORT_NAME,
+		SORT_NAME_REVERSE,
 		SORT_COST,
-		SORT_UPDATED,
+		SORT_COST_REVERSE,
 		SORT_MAX
 	};