2020B causing panels to vanish in App Designer, potential bug?

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Scott 2020-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/599074-2020b-causing-panels-to-vanish-in-app-designer-potential-bug

评论： Marco Frieslaar 2021-5-4

I have an app designer project which was first created in 2019a.

It has been moved into 2019b and later on to 2020a without issues.

Now, when I open the 2020a version in 2020b, it gives me the standard message saying it succesfully converted it to 2020b.

Above is what it looks like after opening, the automatic convertion, and saving the document.

If I now reopen it, the tab group in "IMAGE PARAMETERS" and the three images in the images tab group disappear.

They haven't just moved somewhere, they have vanished from the component browser too.

I am honestly a bit perplexed as to what could be causing this, if not a bug.

I have tried moving the sections away from their location before saving, or renaming the components but no such luck.

It seems it may be related to bug 2066232: Placing a table UI component in a grid layout manager causes App Designer .mlapp file corruption.

As the three images are snapped to a grid layout, and the tab group in "IMAGE PARAMETERS" also uses grid layouts within each tab.

Strangely though, most of the panels/tab groups/etc. use grid layouts, and only the two mentioned previously are affected.

Does anybody have any suggested workarounds, besides the obvious downgrading to 2020a?

Thanks!

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Scott 2020-9-24

I don't think that's the case here. The release notes don't mention any removals of such that would affect me. There are some noted changes to GridLayout, but the release notes say only the background colour of the gridlayout is no longer transparent. I could see this causing items to be hid behind others, but then they would still remain in the component browser, which they unfortunately don't.

Marco Frieslaar 2021-5-4

I am seeing similar problems in 2021a.

My graphs and images keep being deleted and I have to painstakingly put them back in all their detail. But I have also experienced a problem where it won't let me drag and drop a UIAxes back in again.

Also, when I make changes to a component in 'Inspector', there is a long delay before the change materialises on the component and sometimes it doesn't work at all - or, it will be mysteriously deleted a while later.

This version is not good for 'appdesigner' and is just creating more work and so I have gone back to struggling with the previous release. 2021a is a disappointing effort from my viewpoint. I haven't got time for all this faffing about with bugs and major MATLAB foibles.

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