### 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
code_hint = p_hint;
	code_hint_xpos = -0xFFFF;
	queue_redraw();
}
void CodeEdit::set_code_hint_draw_below(bool p_below) {
	code_hint_draw_below = p_below;
	queue_redraw();
}
void CodeEdit::set_code_completion_enabled(bool p_enable) {
	code_completion_enabled = p_enable;
}
bool CodeEdit::is_code_completion_enabled() const {
	return code_completion_enabled;
}
void CodeEdit::set_code_completion_prefixes(const TypedArray<String> &p_prefixes) {
	code_completion_prefixes.clear();
	for (int i = 0; i < p_prefixes.size(); i++) {
		const String prefix = p_prefixes[i];
		ERR_CONTINUE_MSG(prefix.is_empty(), "Code completion prefix cannot be empty.");
		code_completion_prefixes.insert(prefix[0]);
	}
}
TypedArray<String> CodeEdit::get_code_completion_prefixes() const {