### 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;
	}
	code_completion_forced = false;
	code_completion_active = false;
	is_code_completion_drag_started = false;
	queue_redraw();
}
void CodeEdit::set_line_length_guidelines(TypedArray<int> p_guideline_columns) {
	line_length_guideline_columns = p_guideline_columns;
	queue_redraw();
}
TypedArray<int> CodeEdit::get_line_length_guidelines() const {
	return line_length_guideline_columns;
}
void CodeEdit::set_symbol_lookup_on_click_enabled(bool p_enabled) {
	symbol_lookup_on_click_enabled = p_enabled;
	set_symbol_lookup_word_as_valid(false);
}
bool CodeEdit::is_symbol_lookup_on_click_enabled() const {