record: check that we are not committing a merge before patch selection
It might sound like a good idea to use record to filter changes when merging.
If someone attemps this, it's better to tell her "no" right ahead, before the
patch generation/line selection, so she does not spend time doing it just to
receive a red light after that (sometimes rather long) process.
adding bar
adding foo
adding quux1
adding quux2
created new head
merging bar
merging bar failed!
merging foo and baz to baz
1 files updated, 1 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
U bar
R baz
3 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging bar
merging bar failed!
merging baz and foo to baz
1 files updated, 1 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
% show unresolved
U bar
R baz
% unmark baz
% show
U bar
U baz
M bar
M baz
M quux2
? bar.orig
% re-resolve baz
merging baz and foo to baz
% after
U bar
R baz
% resolve all warning
abort: no files or directories specified; use --all to remerge all files
% resolve all
merging bar
warning: conflicts during merge.
merging bar failed!
% after
U bar
R baz