Modify shortcuts and menus to fold/unfold code

Fix #13180
As the same shortcut cannot be assigned to two actions, I removed the ability to fold (fold_line()) or unfold (unfold_line()) via menu (still possible by code), and there is a single fold/unfold action (toggle_fold_line()).

The new default shortcut is now Alt+F

editor/plugins/script_text_editor.cpp

@@ -1015,14 +1015,9 @@ void ScriptTextEditor::_edit_option(int p_op) {
 			tx->end_complex_operation();
 			tx->update();
 		} break;
-		case EDIT_FOLD_LINE: {
+		case EDIT_TOGGLE_FOLD_LINE: {
 
-			tx->fold_line(tx->cursor_get_line());
-			tx->update();
-		} break;
-		case EDIT_UNFOLD_LINE: {
-
-			tx->unfold_line(tx->cursor_get_line());
+			tx->toggle_fold_line(tx->cursor_get_line());
 			tx->update();
 		} break;
 		case EDIT_FOLD_ALL_LINES: {
@@ -1517,13 +1512,9 @@ void ScriptTextEditor::_make_context_menu(bool p_selection, bool p_color, bool p
 		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/indent_right"), EDIT_INDENT_RIGHT);
 		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/toggle_comment"), EDIT_TOGGLE_COMMENT);
 	}
-	if (p_can_fold) {
-		// can fold
-		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/fold_line"), EDIT_FOLD_LINE);
-	} else if (p_is_folded) {
-		// can unfold
-		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/unfold_line"), EDIT_UNFOLD_LINE);
-	}
+	if (p_can_fold || p_is_folded)
+		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/toggle_fold_line"), EDIT_TOGGLE_FOLD_LINE);
+
 	if (p_color) {
 		context_menu->add_separator();
 		context_menu->add_item(TTR("Pick Color"), EDIT_PICK_COLOR);
@@ -1587,9 +1578,8 @@ ScriptTextEditor::ScriptTextEditor() {
 	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/delete_line"), EDIT_DELETE_LINE);
 	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/toggle_comment"), EDIT_TOGGLE_COMMENT);
 	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/clone_down"), EDIT_CLONE_DOWN);
-	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/fold_line"), EDIT_FOLD_LINE);
+	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/toggle_fold_line"), EDIT_TOGGLE_FOLD_LINE);
 	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/fold_all_lines"), EDIT_FOLD_ALL_LINES);
-	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/unfold_line"), EDIT_UNFOLD_LINE);
 	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/unfold_all_lines"), EDIT_UNFOLD_ALL_LINES);
 	edit_menu->get_popup()->add_separator();
 #ifdef OSX_ENABLED
@@ -1668,8 +1658,7 @@ void ScriptTextEditor::register_editor() {
 	ED_SHORTCUT("script_text_editor/indent_right", TTR("Indent Right"), 0);
 	ED_SHORTCUT("script_text_editor/toggle_comment", TTR("Toggle Comment"), KEY_MASK_CMD | KEY_K);
 	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_CMD | KEY_B);
-	ED_SHORTCUT("script_text_editor/fold_line", TTR("Fold Line"), KEY_MASK_ALT | KEY_LEFT);
-	ED_SHORTCUT("script_text_editor/unfold_line", TTR("Unfold Line"), KEY_MASK_ALT | KEY_RIGHT);
+	ED_SHORTCUT("script_text_editor/toggle_fold_line", TTR("Fold/Unfold Line"), KEY_MASK_ALT | KEY_F);
 	ED_SHORTCUT("script_text_editor/fold_all_lines", TTR("Fold All Lines"), 0);
 	ED_SHORTCUT("script_text_editor/unfold_all_lines", TTR("Unfold All Lines"), 0);
 #ifdef OSX_ENABLED

editor/plugins/script_text_editor.h

@@ -91,8 +91,7 @@ class ScriptTextEditor : public ScriptEditorBase {
 		EDIT_TO_UPPERCASE,
 		EDIT_TO_LOWERCASE,
 		EDIT_CAPITALIZE,
-		EDIT_FOLD_LINE,
-		EDIT_UNFOLD_LINE,
+		EDIT_TOGGLE_FOLD_LINE,
 		EDIT_FOLD_ALL_LINES,
 		EDIT_UNFOLD_ALL_LINES,
 		SEARCH_FIND,

scene/gui/text_edit.cpp

@@ -4646,6 +4646,16 @@ void TextEdit::unfold_line(int p_line) {
 	update();
 }
 
+void TextEdit::toggle_fold_line(int p_line) {
+
+	ERR_FAIL_INDEX(p_line, text.size());
+
+	if (!is_folded(p_line))
+		fold_line(p_line);
+	else
+		unfold_line(p_line);
+}
+
 int TextEdit::get_line_count() const {
 
 	return text.size();
@@ -5461,6 +5471,7 @@ void TextEdit::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("unhide_all_lines"), &TextEdit::unhide_all_lines);
 	ClassDB::bind_method(D_METHOD("fold_line", "line"), &TextEdit::fold_line);
 	ClassDB::bind_method(D_METHOD("unfold_line", "line"), &TextEdit::unfold_line);
+	ClassDB::bind_method(D_METHOD("toggle_fold_line", "line"), &TextEdit::toggle_fold_line);
 	ClassDB::bind_method(D_METHOD("can_fold", "line"), &TextEdit::can_fold);
 	ClassDB::bind_method(D_METHOD("is_folded", "line"), &TextEdit::is_folded);
 

scene/gui/text_edit.h

@@ -436,6 +436,7 @@ public:
 	bool is_folded(int p_line) const;
 	void fold_line(int p_line);
 	void unfold_line(int p_line);
+	void toggle_fold_line(int p_line);
 
 	String get_text();
 	String get_line(int line) const;