Re: Bug: jumping stack windows (when supress messages is off)

[David Bovill via use-livecode]

Also tested on Livecode 8.1.5 with same results.
On 9 Oct 2020, 14:00 +0100, David Bovill <david.bov...@gmail.com>, wrote:
>
> Windows intermittently jump to a location on the screen when I move windows. 
> It’s got too annoying to ignore.
>
> • Is anyone else having this problem?
>
> I am testing this on Mojave and Livecode 9.6.1 rc2. I am testing this without 
> any of my own code such just was IDE stacks. This I “think” is quite a long 
> standing bug that I suspect is related to the global coordinate system as I 
> have been working around this for quite a while now.
>
>
> Detail
> The location of the jump seems to be the same horizontal x location. But with 
> the vertical value being reset to the halfway point.
>
> I am testing by. Simply moving the message box. It is intermittent - so 
> occurring about once every 5 moves, and strangely is happening only when the 
> top left of the stack window is within the top left quadrant of the screen. 
> Using. The following code int eh message box I find the top of the message 
> box stack is always 492 after a jump (see below). This appears to be related 
> to half the screen less the decorations like menu?
        > put the screenrect & CR & the rect of stack” Message box"
        >
        > 0,0,1680,1050
        > 215,492,634,640
>
> As a further indication that the problem is due to the IDE, I find that 
> creating a test stack (no scripts or controls) exhibits the same behaviour - 
> but this behaviour can be suppressed by choosing “Suppress Messages” from the 
> “Development” menu. This suppression has no effect on the message box or 
> other IDE windows which still jump intermittently.
>
> The problem is most intense when working with multiple screens. For at least 
> a couple of years stacks I create and place on second or third monitors 
> receive mouse clicks in the wrong location. This happens on different 
> machines, and different. Monitor setups. Only tested on Macs.
>
> I am currently creating a multiscreen app - so taking the tracking down. Of 
> this bug more seriously. The current tests are one on my laptop without 
> external monitors, and having restarted the computer (several times). 
> Applications other than Livecode don’t suffer this problem.
>
> How should I report this bug - should I submit a video / screen recording?
>
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