Saving a scene re-selects a file

[KoBeWi]

Tested versions

4.3 beta1

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 31.0.15.4633) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

Issue description

godot.windows.editor.dev.x86_64_THBBH3li9a.mp4

Steps to reproduce

1. Select a file in FileSystem dock
2. Deselect it by clicking empty space
3. Press Ctrl+S (make sure you are in 2D or 3D editor)

Minimal reproduction project (MRP)

N/A