### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (nvidia) - Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz (6 Threads)

### Issue description

`Area2D`s which extend beyond the bounds of the root viewport, eg. when using a `canvas_items` stretch mode, receive mouse input events even in the black bands letterboxing the game:

https://github.com/godotengine/godot/assets/441188/3beb962f-c1fa-4098-a375-f3d862013577


### Steps to reproduce

1. Set project stretch mode to either `canvas_items` or `viewport`
2. Have an `Area2D` whose `CollisionShape` extends beyond the bounds of the rendered region
3. Connect the `Area2D`'s `mouse_[entered|exited]` signal to something
4. Wave the mouse around in the black areas outside the rendered game

### Minimal reproduction project

Project used for video demo above:

[area2d-oob.zip](https://github.com/godotengine/godot/files/12207031/area2d-oob.zip)

This only demos `mouse_[entered|exited]`, but I first encountered this with the `Area2D.input_event` signal, where it received mouse clicks as well.
panel->set_theme_type_variation(SNAME("TooltipPanel"));
	
	
	Control *base_tooltip = tooltip_owner->make_custom_tooltip(tooltip_text);
	
	if (!base_tooltip) {
		gui.tooltip_label = memnew(Label);
		gui.tooltip_label->set_theme_type_variation(SNAME("TooltipLabel"));
		gui.tooltip_label->set_auto_translate(gui.tooltip_control->is_auto_translating());
		gui.tooltip_label->set_text(tooltip_text);
		base_tooltip = gui.tooltip_label;
		panel->connect("mouse_entered", callable_mp(this, &Viewport::_gui_cancel_tooltip));
	}
	base_tooltip->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	panel->set_transient(true);
	panel->set_flag(Window::FLAG_NO_FOCUS, true);
	panel->set_flag(Window::FLAG_POPUP, false);
	panel->set_flag(Window::FLAG_MOUSE_PASSTHROUGH, true);
	panel->set_wrap_controls(true);
	panel->add_child(base_tooltip);
	panel->gui_parent = this;
	gui.tooltip_popup = panel;
	tooltip_owner->add_child(gui.tooltip_popup);
	Point2 tooltip_offset = GLOBAL_GET("display/mouse_cursor/tooltip_position_offset");
	Rect2 r(gui.tooltip_pos + tooltip_offset, gui.tooltip_popup->get_contents_minimum_size());
	r.size = r.size.min(panel->get_max_size());
	Window *window = gui.tooltip_popup->get_parent_visible_window();
	Rect2i vr;
	if (gui.tooltip_popup->is_embedded()) {
		vr = gui.tooltip_popup->get_embedder()->get_visible_rect();