### 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();
			return;
		}
		if (k->is_action("ui_down", true)) {
			if (code_completion_current_selected < code_completion_options.size() - 1) {
				code_completion_current_selected++;
			} else {
				code_completion_current_selected = 0;
			}
			code_completion_force_item_center = -1;
			queue_redraw();
			accept_event();
			return;
		}
		if (k->is_action("ui_page_up", true)) {
			code_completion_current_selected = MAX(0, code_completion_current_selected - theme_cache.code_completion_max_lines);
			code_completion_force_item_center = -1;
			queue_redraw();
			accept_event();
			return;
		}
		if (k->is_action("ui_page_down", true)) {
			code_completion_current_selected = MIN(code_completion_options.size() - 1, code_completion_current_selected + theme_cache.code_completion_max_lines);
			code_completion_force_item_center = -1;
			queue_redraw();
			accept_event();
			return;
		}
		if (k->is_action("ui_home", true)) {
			code_completion_current_selected = 0;