Merge branch 'nf/mergetool-prompt' into HEAD

UI consistency improvements.

* nf/mergetool-prompt:
difftool/mergetool: make the form of yes/no questions consistent

diff --combined git-mergetool.sh
index f67bab55e85d00b06601fa488ba01975eb865359,2e0635a15cd34911df948ad1b228b5a5f800a4cc..bf862705d8c654a5dd58ec70d6781583b7dbefc3
--- 1/git-mergetool.sh
--- 2/git-mergetool.sh
+++ b/git-mergetool.sh
@@@ -126,12 -126,7 +126,12 @@@ resolve_deleted_merge () 
                case "$ans" in
                [mMcC]*)
                        git add -- "$MERGED"
 -                      cleanup_temp_files --save-backup
 +                      if test "$merge_keep_backup" = "true"
 +                      then
 +                              cleanup_temp_files --save-backup
 +                      else
 +                              cleanup_temp_files
 +                      fi
                        return 0
                        ;;
                [dD]*)
@@@ -140,10 -135,6 +140,10 @@@
                        return 0
                        ;;
                [aA]*)
 +                      if test "$merge_keep_temporaries" = "false"
 +                      then
 +                              cleanup_temp_files
 +                      fi
                        return 1
                        ;;
                esac
@@@ -291,14 -282,8 +291,14 @@@ merge_file () 
                return
        fi
  
 -      mv -- "$MERGED" "$BACKUP"
 -      cp -- "$BACKUP" "$MERGED"
 +      if test -f "$MERGED"
 +      then
 +              mv -- "$MERGED" "$BACKUP"
 +              cp -- "$BACKUP" "$MERGED"
 +      fi
 +      # Create a parent directory to handle delete/delete conflicts
 +      # where the base's directory no longer exists.
 +      mkdir -p "$(dirname "$MERGED")"
  
        checkout_staged_file 1 "$MERGED" "$BASE"
        checkout_staged_file 2 "$MERGED" "$LOCAL"
@@@ -310,9 -295,7 +310,9 @@@
                describe_file "$local_mode" "local" "$LOCAL"
                describe_file "$remote_mode" "remote" "$REMOTE"
                resolve_deleted_merge
 -              return
 +              status=$?
 +              rmdir -p "$(dirname "$MERGED")" 2>/dev/null
 +              return $status
        fi
  
        if is_symlink "$local_mode" || is_symlink "$remote_mode"
@@@ -413,7 -396,7 +413,7 @@@ don
  prompt_after_failed_merge () {
        while true
        do
-               printf "Continue merging other unresolved paths (y/n) ? "
+               printf "Continue merging other unresolved paths [y/n]? "
                read ans || return 1
                case "$ans" in
                [yY]*)

diff --combined t/t7800-difftool.sh
index 4e713f7aa54d4713cfd74978460ec9aa144fc773,df9050f4ef09dcc423e7c8c996541b38932e3691..ff7a9e968f4dde078a131ee65306ae6784e8faa5
--- 1/t/t7800-difftool.sh
--- 2/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@@ -20,7 -20,7 +20,7 @@@ difftool_test_setup (
  prompt_given ()
  {
        prompt="$1"
-       test "$prompt" = "Launch 'test-tool' [Y/n]: branch"
+       test "$prompt" = "Launch 'test-tool' [Y/n]? branch"
  }
  
  # Create a file on master and change it on branch
@@@ -430,11 -430,11 +430,11 @@@ EO
  test_expect_success PERL,SYMLINKS 'difftool --dir-diff --symlink without unstaged changes' '
        cat >expect <<-EOF &&
        file
 -      $(pwd)/file
 +      $PWD/file
        file2
 -      $(pwd)/file2
 +      $PWD/file2
        sub/sub
 -      $(pwd)/sub/sub
 +      $PWD/sub/sub
        EOF
        git difftool --dir-diff --symlink \
                --extcmd "./.git/CHECK_SYMLINKS" branch HEAD &&
@@@ -448,14 -448,14 +448,14 @@@ EO
  run_dir_diff_test 'difftool --dir-diff syncs worktree with unstaged change' '
        test_when_finished git reset --hard &&
        echo "orig content" >file &&
 -      git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
 +      git difftool -d $symlinks --extcmd "$PWD/modify-right-file" branch &&
        echo "new content" >expect &&
        test_cmp expect file
  '
  
  run_dir_diff_test 'difftool --dir-diff syncs worktree without unstaged change' '
        test_when_finished git reset --hard &&
 -      git difftool -d $symlinks --extcmd "$(pwd)/modify-right-file" branch &&
 +      git difftool -d $symlinks --extcmd "$PWD/modify-right-file" branch &&
        echo "new content" >expect &&
        test_cmp expect file
  '
@@@ -466,7 -466,7 +466,7 @@@ EO
  
  test_expect_success PERL 'difftool --no-symlinks does not overwrite working tree file ' '
        echo "orig content" >file &&
 -      git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-file" branch &&
 +      git difftool --dir-diff --no-symlinks --extcmd "$PWD/modify-file" branch &&
        echo "new content" >expect &&
        test_cmp expect file
  '
@@@ -482,7 -482,7 +482,7 @@@ test_expect_success PERL 'difftool --no
                TMPDIR=$TRASH_DIRECTORY &&
                export TMPDIR &&
                echo "orig content" >file &&
 -              test_must_fail git difftool --dir-diff --no-symlinks --extcmd "$(pwd)/modify-both-files" branch &&
 +              test_must_fail git difftool --dir-diff --no-symlinks --extcmd "$PWD/modify-both-files" branch &&
                echo "wt content" >expect &&
                test_cmp expect file &&
                echo "tmp content" >expect &&