### 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)

return shrink;
}
Vector<int> SubViewportContainer::get_allowed_size_flags_horizontal() const {
	return Vector<int>();
}
Vector<int> SubViewportContainer::get_allowed_size_flags_vertical() const {
	return Vector<int>();
}
void SubViewportContainer::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_RESIZED: {
			recalc_force_viewport_sizes();
		} break;
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_VISIBILITY_CHANGED: {
			for (int i = 0; i < get_child_count(); i++) {
				SubViewport *c = Object::cast_to<SubViewport>(get_child(i));
				if (!c) {
					continue;
				}
				if (is_visible_in_tree()) {
					c->set_update_mode(SubViewport::UPDATE_ALWAYS);
				} else {
					c->set_update_mode(SubViewport::UPDATE_DISABLED);
				}
				c->set_handle_input_locally(false); 
			}
		} break;
		case NOTIFICATION_DRAW: {