I've had a bug in one of my plugins that I finally traced to what
appears to be a bug in Vim (8.0.1257): a substitution on one line
of a closed fold affects all lines in that fold.
Here's an example. Create a file, fold_test, as shown.
---------------------------- fold_test ----------------------------
{{{1
line 2
line 3
line 4
line 5
}}}1
line 7
line 8
line 9
line 10
vim: fdm=marker
-------------------------------------------------------------------
Then edit that file as follows.
$ vim -N -u NONE -i NONE fold_test
Note that lines 1 through 6 are folded. Do the following.
:3s/line/dog/
zR
Note that "line" has been changed to "dog" in lines 2 through 5.
Then do the following.
:3s/dog/cat/
Note that "dog" has been changed to "cat" in only line 3, as
expected. The result looks like this.
{{{1
dog 2
cat 3
dog 4
dog 5
}}}1
line 7
line 8
line 9
line 10
vim: fdm=marker
That an explicit substitution on one line affects all lines in the
closed fold looks like a bug to me. It is certainly unexpected.
Regards,
Gary
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