### 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 stretch;
}
void SubViewportContainer::set_stretch_shrink(int p_shrink) {
	ERR_FAIL_COND(p_shrink < 1);
	if (shrink == p_shrink) {
		return;
	}
	shrink = p_shrink;
	recalc_force_viewport_sizes();
	queue_redraw();
}
void SubViewportContainer::recalc_force_viewport_sizes() {
	if (!stretch) {
		return;
	}
	
	for (int i = 0; i < get_child_count(); i++) {
		SubViewport *c = Object::cast_to<SubViewport>(get_child(i));
		if (!c) {
			continue;
		}
		c->set_size_force(get_size() / shrink);
	}
}
int SubViewportContainer::get_stretch_shrink() const {