Script Editor now displays positional column

This solves #17931 and makes the script editor consistent with other text editors(Sublime, Gedit, Vim) in displaying the position rather than the raw number of characters.

editor/code_editor.cpp

@@ -677,7 +677,20 @@ void CodeTextEditor::_reset_zoom() {
 void CodeTextEditor::_line_col_changed() {
 
 	line_nb->set_text(itos(text_editor->cursor_get_line() + 1));
-	col_nb->set_text(itos(text_editor->cursor_get_column() + 1));
+
+	String line = text_editor->get_line(text_editor->cursor_get_line());
+
+	int positional_column = 0;
+
+	for (int i = 0; i < text_editor->cursor_get_column(); i++) {
+		if (line[i] == '\t') {
+			positional_column += text_editor->get_indent_size(); //tab size
+		} else {
+			positional_column += 1;
+		}
+	}
+
+	col_nb->set_text(itos(positional_column + 1));
 }
 
 void CodeTextEditor::_text_changed() {

scene/gui/text_edit.cpp

@@ -4978,6 +4978,11 @@ void TextEdit::set_indent_size(const int p_size) {
 	update();
 }
 
+int TextEdit::get_indent_size() {
+
+	return indent_size;
+}
+
 void TextEdit::set_draw_tabs(bool p_draw) {
 
 	draw_tabs = p_draw;

scene/gui/text_edit.h

@@ -557,6 +557,7 @@ public:
 	void set_indent_using_spaces(const bool p_use_spaces);
 	bool is_indent_using_spaces() const;
 	void set_indent_size(const int p_size);
+	int get_indent_size();
 	void set_draw_tabs(bool p_draw);
 	bool is_drawing_tabs() const;
 	void set_override_selected_font_color(bool p_override_selected_font_color);