### Godot version

4.0.2

### System information

Windows 11

### Issue description

Double clicking on `$MyNode` in the script editor will select the whole name including the "$".

But double clicking on `%MyNode` (unique name) will select the name but will not include the "%".

Dragging a node from the scene tree into the script editor brings up the property/method hint list, even though a "." has not been typed. Pressing enter appends "new()" even though this makes no sense as there is no period so it is just appending it directly to the node name: `$MyNodenew()`


### Steps to reproduce

Type `%MyNode` in a script and double click on it.

Type `@onready var x =` in a script, drag a node from the scene tree, then press enter.


### Minimal reproduction project

N/A
bool shift_pressed = Input::get_singleton()->is_key_pressed(Key::SHIFT);
	if (p_gutter == main_gutter) {
		if (draw_breakpoints && !shift_pressed) {
			set_line_as_breakpoint(p_line, !is_line_breakpointed(p_line));
		} else if (draw_bookmarks && shift_pressed) {
			set_line_as_bookmarked(p_line, !is_line_bookmarked(p_line));
		}
		return;
	}
	if (p_gutter == line_number_gutter) {
		remove_secondary_carets();
		set_selection_mode(TextEdit::SelectionMode::SELECTION_MODE_LINE, p_line, 0);
		select(p_line, 0, p_line + 1, 0);
		set_caret_line(p_line + 1);
		set_caret_column(0);
		return;
	}
	if (p_gutter == fold_gutter) {
		if (is_line_folded(p_line)) {
			unfold_line(p_line);
		} else if (can_fold_line(p_line)) {
			fold_line(p_line);
		}
		return;
	}
}
void CodeEdit::_update_gutter_indexes() {