STR: 1. Load the attachment. 2. Double click on "Editme" in the second box (the one that is in "inline" context). This should select the word. 3. Type something to replace the whole word with some other text. Expected: * The selected word is replaced by the typed text. Actual: * Nothing happens. Notes: * The same STR works well with the first box (in "block" context) * The same STR works fine if the user "manually" selects the word (by a click-and-select action). * The same STR works fine if the user double clicks on anything but the first word in a contenteditable inline element.

Chromium 43 works fine for this STR.

I can still reproduce this in Firefox Nightly 59.0a1 (2017-12-19) (64-bit) MacOS 10.13.1 Other browsers (Chrome and Safari) don't have this issue.