bug#17788: 24.3; ruler-mode: column indicators "hop" left if you drag them diagonally

[martin rudalics]

>    I wrote a (quite rough) patch that seems to resolve all "hop"
> problems on my installation. May I please ask if anyone has time
> and patience to try the patch and report if it provides some benefit.

After applying your earlier patch this won't apply any more.  Kindly
provide a new one against the present trunk.

Thanks, martin