annotate: support diff whitespace filtering flags (issue3030) splitblock() was added to handle blocks returned by bdiff.blocks() which differ only by blank lines but are not made only of blank lines. I do not know exactly how it could happen but mdiff.blocks() threshold behaviour makes me think it can if those blocks are made of very popular lines mixed with popular blank lines. If it is proven to be wrong, the function can be dropped. The first implementation made annotate share diff configuration entries. But it looks like users will user -w/b for annotate but not for diff, on both the command line and hgweb. Since the latter cannot use command line entries, we introduce a new [annotate] section duplicating the diff whitespace options.

--- a/mercurial/patch.py	Sun Nov 20 19:14:36 2011 +0100
+++ b/mercurial/patch.py	Fri Nov 18 12:04:31 2011 +0100
@@ -1527,10 +1527,10 @@
 class GitDiffRequired(Exception):
     pass
 
-def diffopts(ui, opts=None, untrusted=False):
+def diffopts(ui, opts=None, untrusted=False, section='diff'):
     def get(key, name=None, getter=ui.configbool):
         return ((opts and opts.get(key)) or
-                getter('diff', name or key, None, untrusted=untrusted))
+                getter(section, name or key, None, untrusted=untrusted))
     return mdiff.diffopts(
         text=opts and opts.get('text'),
         git=get('git'),