Created attachment 188060 [details]
If a multicol container has scrollable overflow, the column rules are not scrolled along with the content; instead they remain "fixed".
Created attachment 188570 [details]
Created attachment 190464 [details]
Comment on attachment 190464 [details]
I'm sorry we didn't review this sooner. It seems like a good change, but now needs to be adjusted a bit to apply cleanly (since a year has past!) Would you be willing to rebaseline the patch so we could push it through?
Created attachment 230090 [details]
Ooh... Hyatt not CCed. Now he is. :)
Fixing the old multicol implementation at this point is rather unimportant, of course, but I thought at least the test would be nice to have.
This actually fails with the new multicolumn code now that I changed rule painting! Good catch! Let me make a patch for the new code (the old code doesn't matter).
Note column rules don't respect overflow:hidden clips in either old or new versions. We will need a bug on that too, and it's a bit harder to fix. :(
Created attachment 230196 [details]
Fixed in r167820.