Fix error while selecting last empty line

scene/gui/text_edit.cpp

@@ -4234,7 +4234,7 @@ Point2i TextEdit::get_line_column_at_pos(const Point2i &p_pos, bool p_allow_out_
 		if (!p_allow_out_of_bounds) {
 			return Point2i(-1, -1);
 		}
-		return Point2i(text[row].size(), row);
+		return Point2i(text[row].length(), row);
 	}
 
 	int col = 0;

tests/scene/test_text_edit.h

@@ -3261,8 +3261,8 @@ TEST_CASE("[SceneTree][TextEdit] mouse") {
 	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x - 100, end_pos.y - 100), false) == Point2i(90, 0));
 
 	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x - 100, end_pos.y)) == Point2i(90, 0));
-	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x, end_pos.y + 100)) == Point2i(141, 0));
-	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x - 100, end_pos.y + 100)) == Point2i(141, 0));
+	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x, end_pos.y + 100)) == Point2i(140, 0));
+	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x - 100, end_pos.y + 100)) == Point2i(140, 0));
 	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x, end_pos.y - 100)) == Point2i(104, 0));
 	CHECK(text_edit->get_line_column_at_pos(Point2i(end_pos.x - 100, end_pos.y - 100)) == Point2i(90, 0));