Backport PR #1426 on branch 0.12.x (Fix index selector jumping back to 0)#1427

martinRenou merged 2 commits intobqplot:0.12.xbqplot/bqplot:0.12.xfrom

meeseeksmachine:auto-backport-of-pr-1426-on-0.12.xmeeseeksmachine/bqplot:auto-backport-of-pr-1426-on-0.12.xCopy head branch name to clipboard