rebase: in --confirm option just abort if hit a conflict

Before this patch, it was prompting the user in both cases 1) when
there is no conflict 2) when there is at least one conflict. But
for simplicity we can just abort if we hit a conflict and no need to
prompt in that case.

Differential Revision: https://phab.mercurial-scm.org/D3944

hgext/rebase.py

@@ -872,9 +872,6 def _dryrunrebase(ui, repo, opts):
                 rbsrt._prepareabortorcontinue(isabort=True, backup=False,
                                               suppwarns=True)
                 needsabort = False
-                if not ui.promptchoice(_(b'apply changes (yn)?'
-                                         b'$$ &Yes $$ &No')):
-                    return _dorebase(ui, repo, opts, inmemory=False)
             return 1
         else:
             if confirm:

tests/test-rebase-inmemory.t

@@ -472,14 +472,11 Test --confirm option when there is a co
   o  0:cb9a9f314b8b test
      a
   
-  $ hg rebase -s 4 -d . --keep --config ui.interactive=True --confirm << EOF
-  > n
-  > EOF
+  $ hg rebase -s 4 -d . --keep --confirm
   starting in-memory rebase
   rebasing 4:e860deea161a "e"
   merging e
   hit a merge conflict
-  apply changes (yn)? n
   [1]
   $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
   @  9:906d72f66a59 test
@@ -512,58 +509,3 Test --confirm option when there is a co
   o  0:cb9a9f314b8b test
      a
   
-
-  $ hg rebase -s 4 -d . --keep --config ui.interactive=True --confirm << EOF
-  > y
-  > EOF
-  starting in-memory rebase
-  rebasing 4:e860deea161a "e"
-  merging e
-  hit a merge conflict
-  apply changes (yn)? y
-  rebasing 4:e860deea161a "e"
-  merging e
-  warning: conflicts while merging e! (edit, then use 'hg resolve --mark')
-  unresolved conflicts (see hg resolve, then hg rebase --continue)
-  [1]
-
-  $ echo e>e
-  $ hg resolve --mark --all
-  (no more unresolved files)
-  continue: hg rebase --continue
-  $ hg rebase --continue
-  rebasing 4:e860deea161a "e"
-  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
-  o  10:9fa3731dd6df test
-  |  e
-  |
-  @  9:906d72f66a59 test
-  |  conflict with e
-  |
-  o  8:12cbf031f469 test
-  |  d
-  |
-  o  7:c83b1da5b1ae test
-  |  c
-  |
-  o  6:baf10c5166d4 test
-  |  g
-  |
-  o  5:6343ca3eff20 test
-  |  f
-  |
-  | o  4:e860deea161a test
-  | |  e
-  | |
-  | o  3:055a42cdd887 test
-  | |  d
-  | |
-  | o  2:177f92b77385 test
-  |/   c
-  |
-  o  1:d2ae7f538514 test
-  |  b
-  |
-  o  0:cb9a9f314b8b test
-     a
-