The formatting command gqj exhibits unexpected behavior when
executed on a C line comment after a statement. The reformatting is
applied only to the first line of the comment and not to the
following line.
Formatting of C line comments after statements was added with Patch
8.2.3787. It generally works very well. I've recently observed the
behavior described here. It seems like a bug.
Steps to reproduce
1. Start vim as:
$ vim -N -u NONE -i NONE -c 'set cin tw=40'
The 'tw' setting is just for convenience.
2. Enter these lines into the buffer:
#if 0 // This is a long end of
// line comment that
// wraps.
3. Replace the "a" with "another":
#if 0 // This is another long end of
// line comment that
// wraps.
4. With the cursor still on the first line, attempt to reformat the
first two lines with
gqj
The comment now appears like this:
#if 0 // This is another long
// end of
// line comment that
// wraps.
and the cursor is at the start of the third line.
Expected behavior
I expected the comment to appear like this:
#if 0 // This is another long
// end of line comment
// that
// wraps.
That is, with the first two lines of the comment formatted
together and a third line created for what was the last word of
the second line. That is the result obtained when "#if 0" is
not present.
Operating system
Ubuntu 20.03.3 LTS
Xterm 370
Version of Vim
8.2.3930
Regards,
Gary
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