Ctrl-dragging file from FileSystem to code replaces starting digit with underscore

[miv391]

Godot version

v4.2.dev6.official [57a6813]

System information

Godot v4.2.dev6 - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 6GB (NVIDIA; 31.0.15.3640) - Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz (4 Threads)

Issue description

Ctrl-dragging file from FileSystem to code replaces first character with underscore when the file's first character is a digit.

It seems that all invalid characters are replaced with underscore. But when the file name starts with a digit (invalid character only at the beginning), that seems too harsh. I would suggest just adding extra underscrore to the beginning of the variable name. So in this example, I would expect variable name _123_ICON instead of _23_ICON.

Steps to reproduce

1. Duplicate icon.svg and rename the duplicate as 123_icon.svg
2. Ctrl-drag both icon.svg and 123_icon.svg to code
   ->

const _23_ICON = preload("res://123_icon.svg")
const ICON = preload("res://icon.svg")

Minimal reproduction project

N/A