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Bug introduced in 10.1.0 and fixed in 10.2.0

I am observing a potential bug not present in MMA 10.0.1.0 on Win 7 Ultimate, but observable on MMA 10.1 on Win 7 Enterprise. It seems to work with every Manipulate construct. A very simple example is presented below:

Manipulate[Plot[Sin[a x], {x, 0, 2 \[Pi]}], {a, 1, 10}]

After evaluating this expression, move the slider somewhere towards the right, then click on the little + sign to expand the controls. The slider instantly jumps to the leftmost limit, resetting the setting.

Can anybody confirm such behavior and, maybe, confirm this as a bug?

PS In the case that the problem is not observed by other users, I will be back at work tomorrow European afternoon (where I have 10.1/Enterprise) to give more details.

EDIT
As correctly observed in the answer to the linked duplicate question, this is a bug of Manipulator, the default control in Manipulate, however it does not seem to be related to PlotTheme or plotting functions. In any case, other users report the bug to be fixed in 10.2, however the problem in 10.1 is more general than just when using DialogInput as in the linked question: it can be reproduced when starting with any manipulator with initially collapsed controls and then expanding them.

Michael E2
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LLlAMnYP
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  • Confirmed. It's fixed in 10.2.0. – ilian Jul 20 '15 at 21:22
  • It wasn't like that on v9 :) – Dr. belisarius Jul 20 '15 at 21:23
  • @ilian Do you also have Win7 enterprise? To everyone else: can anyone confirm this as 10.1-specific or system specific or whatever? As soon as this is localized, the best possible answer would be to post where and under which OS this happens. Also I'm suprprised, that this question didn't come up before :-) – LLlAMnYP Jul 20 '15 at 21:27
  • @LLIAMnYP Not OS specific. – ilian Jul 20 '15 at 21:34
  • It was noticed by @halirutan in chat and i also confirmed that – SquareOne Jul 20 '15 at 22:35
  • @MarcoB partially I agree. The linked Q and the Qs within the linked Q all seem to describe similar although more specific problems. I'd particularly note http://mathematica.stackexchange.com/questions/73489/resizing-or-moving-notebook-window-causes-manipulate-to-update-its-argument . Can anyone check if my implementation of the error is present in 10.0.2? For my part, I'll see, if the problem is observed without plotting functions later today. But I think we already have enough info to answer "Introduced in 10.x.x, fixed in 10.2"... – LLlAMnYP Jul 21 '15 at 05:51
  • I'm just reluctant to do this myself without having the info first-hand (and without access to 10.2). – LLlAMnYP Jul 21 '15 at 05:56
  • You might add that Kuba's answer to the linked duplicate has nothing to do with PlotTheme or DialogInput, but points out that the problem is with Manipulator. So the generality of the problem is addressed in the answer, even if the original question contained red herrings. – Michael E2 Jul 21 '15 at 15:27
  • @MichaelE2 yes, that was the point of my edit. My question does have an answer there, it just hasn't been explicitly asked :-D – LLlAMnYP Jul 21 '15 at 15:43
  • Ah, I read the "however" as contrasting with Kuba's answer. – Michael E2 Jul 21 '15 at 19:28

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