import: disallow meaningless combination of "--exact" and "--edit"

Before this patch, "hg import" allows combination of "--exact" and
"--edit", even though editing commit message breaks exact-ness.

This patch disallows meaningless combination of "--exact" and "--edit".

mercurial/commands.py

@@ -3880,6 +3880,8 b' def import_(ui, repo, patch1=None, *patc'
         raise util.Abort(_('similarity must be between 0 and 100'))
     if sim and not update:
         raise util.Abort(_('cannot use --similarity with --bypass'))
+    if opts.get('exact') and opts.get('edit'):
+        raise util.Abort(_('cannot use --exact with --edit'))
 
     if update:
         cmdutil.checkunfinished(repo)

tests/test-import-bypass.t

@@ -22,10 +22,13 b' Test --bypass with other options'
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
 
 Test importing an existing revision
-(this also tests that editor is not invoked for '--bypass', if the
-patch contains the commit message, regardless of '--edit')
+(this also tests that "hg import" disallows combination of '--exact'
+and '--edit')
 
-  $ HGEDITOR=cat hg import --bypass --exact --edit ../test.diff
+  $ hg import --bypass --exact --edit ../test.diff
+  abort: cannot use --exact with --edit
+  [255]
+  $ hg import --bypass --exact ../test.diff
   applying ../test.diff
   $ shortlog
   o  1:4e322f7ce8e3 test 0 0 - foo - changea
@@ -66,8 +69,10 b' Test --user, --date and --message'
   repository tip rolled back to revision 1 (undo import)
 
 Test --import-branch
+(this also tests that editor is not invoked for '--bypass', if the
+patch contains the commit message, regardless of '--edit')
 
-  $ hg import --bypass --import-branch ../test.diff
+  $ HGEDITOR=cat hg import --bypass --import-branch --edit ../test.diff
   applying ../test.diff
   $ shortlog
   o  1:4e322f7ce8e3 test 0 0 - foo - changea