bug#6968: 23.1; vc-hg-next-version fails if a custom style is used

[Kirk Kelsey]

I've run into a problem with vc-hg-next-version and how it

identifies the maximum valid revision (the tip). Mercurial allows

for a templating of output for some commands, but

vc-hg-next-version identifies the tip using a regular _expression_

that only matches the "default" output style. 

The patch below works by specifying the style explicitly.

Something similar is done for vc-hg-revision-table, where the

template for the log command is specified. FWIW, I took at look

at the other uses of vc-hg-command and didn't see any other cases

where the style seemed relevant. It is possible to work around

the issue by setting vc-hg-global-switches to include "--config

ui.style=default" (not using the --style option).

Thanks,

Kirk

--- /tmp/vc-hg.el       2010-09-01 16:48:56.000000000 -0400

+++ /tmp/vc-hg.fixed.el 2010-09-01 16:50:18.597813591 -0400

@@ -354,7 +354,7 @@

   (let ((newrev (1+ (string-to-number rev)))

         (tip-revision

          (with-temp-buffer

-           (vc-hg-command t 0 nil "tip")

+           (vc-hg-command t 0 nil "tip" "--style=default")

            (goto-char (point-min))

            (re-search-forward "^changeset:[ \t]*\\([0-9]+\\):")

            (string-to-number (match-string-no-properties 1)))))