### 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 (gui.mouse_focus == p_control) {
		gui.mouse_focus = nullptr;
		gui.forced_mouse_focus = false;
		gui.mouse_focus_mask.clear();
	}
	if (gui.last_mouse_focus == p_control) {
		gui.last_mouse_focus = nullptr;
	}
	if (gui.key_focus == p_control) {
		gui.key_focus = nullptr;
	}
	if (gui.mouse_over == p_control) {
		gui.mouse_over = nullptr;
	}
	if (gui.drag_mouse_over == p_control) {
		gui.drag_mouse_over = nullptr;
	}
	if (gui.tooltip_control == p_control) {
		gui.tooltip_control = nullptr;
	}
}
Window *Viewport::get_base_window() const {