undo manager AssertionError about gaphor HOT 5 CLOSED

Hi @Sycophantic-Witty, thanks for your report.

I can reproduce it (I think).

1. Open a model containing a connected association (e.g. test-models/all-elements.gaphor)
2. Select the association (see where it is in the model browser)
3. Select another element
4. Click the association in the model browser
5. An error toast shows

For me, it happens as soon as I select the association. It looks like it works okay for other relationship elements it seems.

It looks like it's caused by the member end field. If I leave it empty, I see no error, if it contains a name for the association end, I get the error.

This is a new error in 2.25: before that, the property editor was not updated when you select an element in the model browser.

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Hi @amolenaar,

Today, I did not immediately faced the issue with my model (although it came back later), so I tried to reproduce it with a new model (attached).
I created two SysML blocks and a composite relationship between them in the "[bdd] Feature Domain" diagram of a new SysML model and saved with only the "Model Navigation" diagram opened.
When I restart Gaphor and open this model, the "Model Navigation" diagram appears half-updated: borders only, no text displayed.
If I now open the "[bdd] Feature Domain" diagram, I see the same kind of half-updated diagram. Clicking on the relationship between the two blocks in the "Model Browser" triggers the assertion error.
test-model.zip

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@all-contributors please add @Sycophantic-Witty for bug

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@danyeaw

@Sycophantic-Witty already contributed before to bug

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Thanks @Sycophantic-Witty for the issue report 👍

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