line endings have doubled or something

[unitycoder]

see this and some others, lots of empty lines:
https://github.com/UnityCommunity/UnityLibrary/blob/master/Assets/Shaders/2D/Effects/Glow.shader

[hasanbayatme]

I think different operating systems line endings caused this.

May we can search for some solutions, also the Git version control warned about this.