### 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
if (!code_completion_active) {
		return Dictionary();
	}
	ERR_FAIL_INDEX_V(p_index, code_completion_options.size(), Dictionary());
	Dictionary option;
	option["kind"] = code_completion_options[p_index].kind;
	option["display_text"] = code_completion_options[p_index].display;
	option["insert_text"] = code_completion_options[p_index].insert_text;
	option["font_color"] = code_completion_options[p_index].font_color;
	option["icon"] = code_completion_options[p_index].icon;
	option["location"] = code_completion_options[p_index].location;
	option["default_value"] = code_completion_options[p_index].default_value;
	return option;
}
int CodeEdit::get_code_completion_selected_index() const {