crecord: avoid duplicating lines when reverting noeol->eol change
When reversing a patch that looks like this while using crecord:
```
@@ -301,4 +302,4 @@ zza
zzb
zzc
zzd
-zze
\ No newline at end of file
+zze
```
we would previously reverse the `-zze` line to be an add, encounter the "no
newline" line and stop inspecting lines. This caused us to duplicate the line,
producing `zzezze` (still without a newline).
`break` is the correct action if we know there will be no lines afterwards, as
would be the case in an eol -> noeol transition. It is incorrect if there are
lines afterward, such as if both sides are missing the newline or if only the
lhs is missing the newline.
Differential Revision: https://phab.mercurial-scm.org/D12441
#require curses
#testcases committed wdir
Revert interactive tests with the Curses interface
$ cat <<EOF >> $HGRCPATH
> [ui]
> interactive = true
> interface = curses
> [experimental]
> crecordtest = testModeCommands
> EOF
TODO: Make a curses version of the other tests from test-revert-interactive.t.
#if committed
$ maybe_commit() {
> hg ci "$@"
> }
$ do_revert() {
> hg revert -ir'.^'
> }
#else
$ maybe_commit() {
> true
> }
$ do_revert() {
> hg revert -i
> }
#endif
When a line without EOL is selected during "revert -i"
$ hg init $TESTTMP/revert-i-curses-eol
$ cd $TESTTMP/revert-i-curses-eol
$ echo 0 > a
$ hg ci -qAm 0
$ printf 1 >> a
$ maybe_commit -qAm 1
$ cat a
0
1 (no-eol)
$ cat <<EOF >testModeCommands
> c
> EOF
$ do_revert
reverting a
$ cat a
0
When a selected line is reverted to have no EOL
$ hg init $TESTTMP/revert-i-curses-eol2
$ cd $TESTTMP/revert-i-curses-eol2
$ printf 0 > a
$ hg ci -qAm 0
$ echo 0 > a
$ maybe_commit -qAm 1
$ cat a
0
$ cat <<EOF >testModeCommands
> c
> EOF
$ do_revert
reverting a
$ cat a
0 (no-eol)