From c2a1f3b8146f939c837b8997b7f6673fac7508d8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20J=2E=20Est=C3=A9banez?= <pedrojrulez@gmail.com>
Date: Tue, 22 Aug 2017 19:52:17 +0200
Subject: Add ability to undo auto-indent

Closes #10420.
---
 editor/plugins/script_text_editor.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/editor/plugins/script_text_editor.cpp b/editor/plugins/script_text_editor.cpp
index 19de027287..e69fa6da88 100644
--- a/editor/plugins/script_text_editor.cpp
+++ b/editor/plugins/script_text_editor.cpp
@@ -977,16 +977,27 @@ void ScriptTextEditor::_edit_option(int p_op) {
 			Ref<Script> scr = get_edited_script();
 			if (scr.is_null())
 				return;
+
+			te->begin_complex_operation();
 			int begin, end;
 			if (te->is_selection_active()) {
 				begin = te->get_selection_from_line();
 				end = te->get_selection_to_line();
+				// ignore if the cursor is not past the first column
+				if (te->get_selection_to_column() == 0) {
+					end--;
+				}
 			} else {
 				begin = 0;
 				end = te->get_line_count() - 1;
 			}
 			scr->get_language()->auto_indent_code(text, begin, end);
-			te->set_text(text);
+			Vector<String> lines = text.split("\n");
+			for (int i = begin; i <= end; ++i) {
+				te->set_line(i, lines[i]);
+			}
+
+			te->end_complex_operation();
 
 		} break;
 		case EDIT_TRIM_TRAILING_WHITESAPCE: {
-- 
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