Modifies indentation behaviours

Partially fixes #14559 (see the issue for details);
Removes some code redondancy ;
Adds the possibility to indent left and right without selecting text ;
Adds the entries to the context menu when text is not selected ;
Renames indent_selection_left() and indent_selection_right() to indent_left() and indent_right() ;
Unifies context menus of shader text editor and script text editor.

2 files changed, 8 insertions, 67 deletions

diff --git a/editor/plugins/script_text_editor.cpp b/editor/plugins/script_text_editor.cpp
index 95f2739927..17b0e986e7 100644
--- a/editor/plugins/script_text_editor.cpp
+++ b/editor/plugins/script_text_editor.cpp
@@ -924,26 +924,7 @@ void ScriptTextEditor::_edit_option(int p_op) {
 			if (scr.is_null())
 				return;
 
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				tx->indent_selection_left();
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-				// begins with tab
-				if (line_text.begins_with("\t")) {
-					line_text = line_text.substr(1, line_text.length());
-					tx->set_line(begin, line_text);
-				}
-				// begins with 4 spaces
-				else if (line_text.begins_with("    ")) {
-					line_text = line_text.substr(4, line_text.length());
-					tx->set_line(begin, line_text);
-				}
-			}
-			tx->end_complex_operation();
-			tx->update();
-			//tx->deselect();
+			tx->indent_left();
 		} break;
 		case EDIT_INDENT_RIGHT: {
 
@@ -951,18 +932,7 @@ void ScriptTextEditor::_edit_option(int p_op) {
 			if (scr.is_null())
 				return;
 
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				tx->indent_selection_right();
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-				line_text = '\t' + line_text;
-				tx->set_line(begin, line_text);
-			}
-			tx->end_complex_operation();
-			tx->update();
-			//tx->deselect();
+			tx->indent_right();
 		} break;
 		case EDIT_DELETE_LINE: {
 
@@ -1503,14 +1473,15 @@ void ScriptTextEditor::_make_context_menu(bool p_selection, bool p_color, bool p
 	context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/select_all"), EDIT_SELECT_ALL);
 	context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/undo"), EDIT_UNDO);
 	context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/redo"), EDIT_REDO);
+	context_menu->add_separator();
+	context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/indent_left"), EDIT_INDENT_LEFT);
+	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_selection) {
 		context_menu->add_separator();
 		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/convert_to_uppercase"), EDIT_TO_UPPERCASE);
 		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/convert_to_lowercase"), EDIT_TO_LOWERCASE);
-		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/indent_left"), EDIT_INDENT_LEFT);
-		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 || p_is_folded)
 		context_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/toggle_fold_line"), EDIT_TOGGLE_FOLD_LINE);
diff --git a/editor/plugins/shader_editor_plugin.cpp b/editor/plugins/shader_editor_plugin.cpp
index b390070b4a..1d8afe7b95 100644
--- a/editor/plugins/shader_editor_plugin.cpp
+++ b/editor/plugins/shader_editor_plugin.cpp
@@ -379,26 +379,7 @@ void ShaderEditor::_menu_option(int p_option) {
 			if (shader.is_null())
 				return;
 
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				tx->indent_selection_left();
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-				// begins with tab
-				if (line_text.begins_with("\t")) {
-					line_text = line_text.substr(1, line_text.length());
-					tx->set_line(begin, line_text);
-				}
-				// begins with 4 spaces
-				else if (line_text.begins_with("    ")) {
-					line_text = line_text.substr(4, line_text.length());
-					tx->set_line(begin, line_text);
-				}
-			}
-			tx->end_complex_operation();
-			tx->update();
-			//tx->deselect();
+			tx->indent_left();
 
 		} break;
 		case EDIT_INDENT_RIGHT: {
@@ -407,18 +388,7 @@ void ShaderEditor::_menu_option(int p_option) {
 			if (shader.is_null())
 				return;
 
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				tx->indent_selection_right();
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-				line_text = '\t' + line_text;
-				tx->set_line(begin, line_text);
-			}
-			tx->end_complex_operation();
-			tx->update();
-			//tx->deselect();
+			tx->indent_right();
 
 		} break;
 		case EDIT_DELETE_LINE: {