### 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
switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			set_gutter_width(main_gutter, get_line_height());
			set_gutter_width(line_number_gutter, (line_number_digits + 1) * theme_cache.font->get_char_size('0', theme_cache.font_size).width);
			set_gutter_width(fold_gutter, get_line_height() / 1.2);
		} break;
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			const Size2 size = get_size();
			const bool caret_visible = is_caret_visible();
			const bool rtl = is_layout_rtl();
			const int row_height = get_line_height();
			if (line_length_guideline_columns.size() > 0) {
				const int xmargin_beg = theme_cache.style_normal->get_margin(SIDE_LEFT) + get_total_gutter_width();
				const int xmargin_end = size.width - theme_cache.style_normal->get_margin(SIDE_RIGHT) - (is_drawing_minimap() ? get_minimap_width() : 0);
				const float char_size = theme_cache.font->get_char_size('0', theme_cache.font_size).width;
				for (int i = 0; i < line_length_guideline_columns.size(); i++) {
					const int xoffset = xmargin_beg + char_size * (int)line_length_guideline_columns[i] - get_h_scroll();
					if (xoffset > xmargin_beg && xoffset < xmargin_end) {
						Color guideline_color = (i == 0) ? theme_cache.line_length_guideline_color : theme_cache.line_length_guideline_color * Color(1, 1, 1, 0.5);
						if (rtl) {
							RenderingServer::get_singleton()->canvas_item_add_line(ci, Point2(size.width - xoffset, 0), Point2(size.width - xoffset, size.height), guideline_color);
							continue;
						}
						RenderingServer::get_singleton()->canvas_item_add_line(ci, Point2(xoffset, 0), Point2(xoffset, size.height), guideline_color);