### Godot version

v4.2.dev.custom_build [c3b0a92c3]

### System information

Debian Linux X11 Xfce

### Issue description

In the following scene tree it is not possible to write anything in `LineEditB`.
![image](https://github.com/godotengine/godot/assets/6299227/ce5f696a-d86a-402f-98f7-6a762f15543e)

I would expect, that it is possible to focus `LineEditB` with a mouse click and write into it.

Regression from #58334

### Steps to reproduce

1. Load and run MRP
2. Mouse Click into the left LineEditB
3. Type Keyboard => No letters appear in the LineEditB

Variant:

1. Load and run MRP
2. Mouse Click into the right LineEditA
3. Mouse Click into the left LineEditB
4. Type Keyboard => Letters appear in LineEditA instead of LineEditB


### Minimal reproduction project

[BugKeyInputRouting.zip](https://github.com/godotengine/godot/files/11994804/BugKeyInputRouting.zip)

if (!drag_preview || (c != drag_preview && !drag_preview->is_ancestor_of(c))) {
		return c;
	}
	return nullptr;
}
bool Viewport::_gui_drop(Control *p_at_control, Point2 p_at_pos, bool p_just_check) {
	
	CanvasItem *ci = p_at_control;
	while (ci) {
		Control *control = Object::cast_to<Control>(ci);
		if (control) {
			if (control->can_drop_data(p_at_pos, gui.drag_data)) {
				if (!p_just_check) {
					control->drop_data(p_at_pos, gui.drag_data);
				}
				return true;
			}
			if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP) {
				break;
			}
		}
		p_at_pos = ci->get_transform().xform(p_at_pos);
		if (ci->is_set_as_top_level()) {
			break;
		}
		ci = ci->get_parent_item();
	}
	return false;
}
void Viewport::_gui_input_event(Ref<InputEvent> p_event) {