+++ This bug was initially created as a clone of Bug #1103348 +++ Modified STR to demonstrate bad behavior even after bug 1103348: (1) In a new tab, load a simple dir=auto testcase: data:text/html,<div dir="ltr"><div contenteditable dir="auto" style="border:1px solid;padding:2px;width:200px;height:2em"></div></div> (2) Click in the contenteditable <div>, and type some Western digits (e.g. "123"). The text is displayed with LTR directionality, as expected. (3) Switch to an Arabic keyboard and append a few letters. Directionality correctly becomes RTL. (4) Backspace to remove the RTL letters just added; when the last one is removed, the directionality correctly reverts to LTR. (5) Now type the Arabic letters again. This time, the directionality incorrectly remains LTR.

(Removing 'regression' keyword, as I'm not sure this has ever worked properly.)

https://hg.mozilla.org/integration/mozilla-inbound/rev/b89b70fcd8f2 https://hg.mozilla.org/integration/mozilla-inbound/rev/fc7d84d79430

https://hg.mozilla.org/mozilla-central/rev/b89b70fcd8f2 https://hg.mozilla.org/mozilla-central/rev/fc7d84d79430