Dropping into script editor does not fully replace selected text

[KoBeWi]

Tested versions

4.3 beta2 broken
4.2.2 works
I think it's recent, but I didn't test other versions.

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_Vdm2sK0iye.mp4

The part after drop position is untouched. Whole selection used to be replaced.

Steps to reproduce

1. Open a script
2. Select a word
3. Drop something in the middle of your selection (file or node)

Minimal reproduction project (MRP)

N/A