Empty lines should be ignored when comment/uncomment code

[jsjtxietian]

Godot version

Godot v4.2.dev (fc99492)

System information

Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Ti (NVIDIA; 31.0.15.3699) - 12th Gen Intel(R) Core(TM) i7-12700F (20 Threads)

Issue description

1. Inserting a newline in the commented code and then uncomment all of them won't work, godot will think the new line (usually just a '\t' or '\n') is uncommented, so it assumes the whole code block is uncommented and will comment all the code again.
2. Comment will work when comment a empty line, by empty I mean the line only consist of '\t' '\n' and ' '

Steps to reproduce

For 1, write some code like this:

	var a = 1
	var b = 2

comment them by ctrl + k, and press enter after #var a = 1 to make a new line, it should look like this:

	#var a = 1
		
	#var b = 2

And uncomment all the three lines together, you will get this instead of uncommentting all the lines

	##var a = 1
#
	##var b = 2

For 2, it's trivial to reproduce.

Minimal reproduction project

Any project should work.

I has already fixed it in my local branch, but I think it need mroe disscussion about which behavior is intented and which is not.
I can understand the behaviour of point 2 to some extent but point 1 really brings inconvenience.

After the disscussion, I can update my fix and create a pr for it if necessary.

[timothyqiu]

I think ignoring empty lines makes sense when uncommenting. VS Code and commentary.vim also work like this.

I don't mind being able to comment an empty line.

[jsjtxietian]

I found an interesting case relating the detail of this code logic, in the code godot will first decide it is a comment behaviour or uncomment behaviour based on whether any line doesn't contain a '#'.

But when the code you want to operate only contains empty line, the origin logic will break if we just ignore empty lines, I added a special case in the code, take a look and your suggestions are welcomed.