1) Open any item with a two-words sitelink, e.g. https://www.wikidata.org/wiki/Q3524984
2) Click edit sitelinks and type something in the middle, e.g. "Hardie" after "Thomas"
I. Observed: after each and every keystroke, the cursor goes to the end of the text area, forcing me to click the back arrow to reach the point where I need to continue.
II. Expected: the cursor shouldn't move at all.