### 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 (stretch) {
		return Size2();
	}
	Size2 ms;
	for (int i = 0; i < get_child_count(); i++) {
		SubViewport *c = Object::cast_to<SubViewport>(get_child(i));
		if (!c) {
			continue;
		}
		Size2 minsize = c->get_size();
		ms.width = MAX(ms.width, minsize.width);
		ms.height = MAX(ms.height, minsize.height);
	}
	return ms;
}
void SubViewportContainer::set_stretch(bool p_enable) {
	if (stretch == p_enable) {
		return;
	}
	stretch = p_enable;
	recalc_force_viewport_sizes();
	update_minimum_size();
	queue_sort();
	queue_redraw();
}
bool SubViewportContainer::is_stretch_enabled() const {