Remove all remaining "-rtl.css" references

Did you grep for any other leftover -rtl occurrences? If so, then I guess we can RTBC this already.

Agreed, looks good.

Do any of these need to be incorporated in the patch?

Searching 5583 files for "-rtl"

core/modules/color/css/color.admin.css:
   75:   background: url(images/hook-rtl.png) no-repeat 0 0;

core/modules/system/css/system.theme.css:
  387:   list-style-image: url(../../misc/menu-collapsed-rtl.png);

core/themes/bartik/css/style.css:
  820:   background-image: url(../images/comment-arrow-rtl.gif);

core/themes/seven/style.css:
  464:   background: url(images/list-item-rtl.png) no-repeat right 11px;
 1086:   background: transparent url(images/task-item-rtl.png) no-repeat right 50%;

5 matches across 4 files

Searched for -rtl excluding vendor/* after applying the patch from the issue summary.

No this issue is about removing references / uses of the old -rtl.css autodiscovery feature. Image replacements for RTL still apply.

Ok cool, RTBC +1:)

Committed and pushed to 8.x. Thanks!

Yay, thanks all!

Superb, thanks!