The first line after // vfmt off is replaced with // vfmt on if the first line ends with a comment

[revosw]

Describe the bug

The first line after // vfmt off is replaced with // vfmt on if the first line ends with a comment.

Reproduction Steps

Code: https://play.vlang.io/p/472fc92506

fn main() {
	// vfmt off
	num := 4 // some comment
	// vfmt on
}

Format the code using the format button in the playground link, or run v fmt -w on the file

Expected Behavior

The code is left untouched:

fn main() {
	// vfmt off
	num := 4 // some comment
	// vfmt on
}

Current Behavior

Output:

fn main() {
	// vfmt off
	// vfmt on
	// vfmt on
}

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.9 b91bbad

Environment details (OS name and version, etc.)

|V full version      |V 0.4.9 b91bbad
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux 12 (bookworm) (VM)
|Processor           |2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
|Memory              |1.24GB/2.02GB
|                    |
|V executable        |/home/admin/v/v
|V last modified time|2025-01-31 21:25:26
|                    |
|V home dir          |OK, value: /home/admin/v
|VMODULES            |OK, value: .vmodules
|VTMP                |OK, value: /tmp/v_0
|Current working dir |OK, value: /home/admin/playground
|                    |
|Git version         |git version 2.39.5
|V git status        |Error: fatal: detected dubious ownership in repository at '/home/admin/v'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v
|.git/config present |true
|                    |
|cc version          |cc (Debian 12.2.0-14) 12.2.0
|gcc version         |gcc (Debian 12.2.0-14) 12.2.0
|clang version       |Debian clang version 14.0.6
|tcc version         |tcc version 0.9.28rc 2024-07-31 HEAD@1cee0908 (x86_64 Linux)
|tcc git status      |Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc
 Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc

|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.36-9+deb12u8) 2.36

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[huly-for-github]

Connected to Huly®: V_0.6-22053

[spytheman]

I can not reproduce it with the code from the issue, but the one from the playground triggers the bug:

enum Enum {
	// vfmt off
	entry // comment
	// vfmt on
}

becomes:

enum Enum {
	// vfmt off
	// vfmt on
	// vfmt on
}

after running v fmt -w file.v

[spytheman]

Locally the enums work too.

I think, that it is specific to the playground: