### 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)

ERR_READ_THREAD_GUARD_V(DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST);
	return default_canvas_item_texture_filter;
}
void Viewport::set_default_canvas_item_texture_repeat(DefaultCanvasItemTextureRepeat p_repeat) {
	ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_INDEX(p_repeat, DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_MAX);
	if (default_canvas_item_texture_repeat == p_repeat) {
		return;
	}
	default_canvas_item_texture_repeat = p_repeat;
	switch (default_canvas_item_texture_repeat) {
		case DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_DISABLED:
			RS::get_singleton()->viewport_set_default_canvas_item_texture_repeat(viewport, RS::CANVAS_ITEM_TEXTURE_REPEAT_DISABLED);
			break;
		case DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_ENABLED:
			RS::get_singleton()->viewport_set_default_canvas_item_texture_repeat(viewport, RS::CANVAS_ITEM_TEXTURE_REPEAT_ENABLED);
			break;
		case DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_MIRROR:
			RS::get_singleton()->viewport_set_default_canvas_item_texture_repeat(viewport, RS::CANVAS_ITEM_TEXTURE_REPEAT_MIRROR);
			break;
		default: {
		}
	}
}
Viewport::DefaultCanvasItemTextureRepeat Viewport::get_default_canvas_item_texture_repeat() const {