Redmine

What SCM are you using ? With Subversion, you should get a message.
Example here on redmine.org: http://www.redmine.org/repositories/annotate/redmine/trunk/public/images/1downarrow.png

Sorry, I didn't see that you said "svn repository".
Don't you get the same error message on your install ?

My mistake. The 'Annotate' behaves as expected, it's the 'Compare Differences' that shows no error message.

OK, I'll check it.

Even worse: the changes in binary files are not even mentioned when comparing the whole revisions:
https://www.redmine.org/projects/redmine/repository/svn/diff?utf8=%E2%9C%93&rev=10141&rev_to=10140
This simply suggests, there was no change at all between these revisions.
But of course there was a change:
https://www.redmine.org/projects/redmine/repository/svn/revisions/10141

And since 15 years no progress in this essential fail? I mean, if I compare revisions, I must rely on getting to see all changes, no matter, if they are diffable or not. If it's a binary, no reason to ignore that change at all.
Did I miss something? Is there any workaround available?

Peter Kövesdi wrote in #note-7:

Even worse: the changes in binary files are not even mentioned when comparing the whole revisions:

I made a littel tweaky, ugly solution: I added the following to the top of `app/views/common/_diff.html.erb`:

<% diff1=[]
diff.each { |line| 
  if line =~ /Binary files (.+?) and (.+?) differ/ 
    diff1.append("--- "+$1+"\n")
    diff1.append("+++ "+$2+"\n")
    diff1.append("@@ -0,0 +0,0 @@\n")
    diff1.append(" Binary file")
  else
    diff1.append(line)
  end
  diff = diff1
} %>