Hi Christoph,
I cannot reproduce. It seems like bounds soon get rounded in my image:

    (SystemWindow new openInWorld extent: (24214/31)@(11565/31)) bounds
extent.
        781 at 373

Le mar. 22 oct. 2019 à 13:40, Thiede, Christoph <
Christoph.Thiede at student.hpi.uni-potsdam.de> a écrit :

> Hi all,
>
>
> In the latest days, I encountered flickering problems caused by
> non-integer bounds of system windows again. For me, the following fails
> reproducibly in different images:
>
>
> SystemWindow new openInWorld extent: (24214/31)@(11565/31).
>
>
> If I hover and unhover the window a few times, its contents are drawn
> badly and incompletely like this:
>
>
>
>
>
>    - As you can see, the issue also affects other morphs in the same
>    region (in the screenshot I am hovering the implementors button of the
>    background browser).
>    - The issue only occurs with very complex fractions, so the extent 500
>    @ 300 / 2 would not be a problem (at least in my image). I could not
>    reproduce it using floats.
>    - The situation can be also reproduced by composing a few morphs
>    manually, but the more submorphs there, the higher the flickering rate
>    appears to be.
>    - [World imageForm] does not contain any abnormalities, maybe the
>    problem is related to the damage recording?
>
>
> I would like to solve this bug, but I'm not sure where the problem
> actually arises. In general, should morphs be allowed to have non-integer
> bounds? This could be useful e. g. for exact animations, but
> we already have some rounding that (unfortunately) rule out this use case:
>
>
>    - #position: appears to round the delta value for movement
>    - #extent: and #bounds: do no rounding at all.
>
> Should we maybe apply some rounding or at least truncating there? Or just
> convert the arguments using #asFloat before?
> Or do you have any idea how one could debug the problem?
>
> (For relevancy: I often call Preferences >> #changeFontSize:, and each
> time all windows are drawn badly until I round their bounds. This can
> indeed be quite annoying:
> )
>
> Looking forward to your help!
> Best,
> Christoph
>
>
>
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