### 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
accept_event();
			queue_redraw();
			return;
		}
		if (code_completion_active && code_completion_rect.has_point(mb->get_position())) {
			if (!mb->is_pressed()) {
				accept_event();
				return;
			}
			is_code_completion_drag_started = true;
			switch (mb->get_button_index()) {
				case MouseButton::WHEEL_UP: {
					if (code_completion_current_selected > 0) {
						code_completion_current_selected--;
						code_completion_force_item_center = -1;
						queue_redraw();
					}
				} break;
				case MouseButton::WHEEL_DOWN: {
					if (code_completion_current_selected < code_completion_options.size() - 1) {
						code_completion_current_selected++;
						code_completion_force_item_center = -1;
						queue_redraw();
					}
				} break;
				case MouseButton::LEFT: {
					if (code_completion_force_item_center == -1) {
						code_completion_force_item_center = code_completion_current_selected;
					}
					code_completion_current_selected = CLAMP(code_completion_line_ofs + (mb->get_position().y - code_completion_rect.position.y) / get_line_height(), 0, code_completion_options.size() - 1);