Why does Simulink mark a subsystem in purple?

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Simulink has marked a subsystem with a purple border. The border color of the block itself is still black, but there is another purple/magenta highlight border around it.
Why is this?

Accepted Answer

Jonas on 1 Mar 2021
Received feedback from MathWorks Support that it is a bug that the purple highlighting persists and a bug fix has been requested.

More Answers (1)

Qi Li
Qi Li on 26 Feb 2021
Hi Jonas,
Please refer to this document hilite_system for more details of highlighting style.
Best regards,
Jonas on 1 Mar 2021
I have noticed that if I close the model and reopen, the subsystem is not marked in purple anymore. However, when I go inside the subsystem and click on a Goto block, it markes a corresponding From block and ALSO marks the subsystem it is in. Upon de-clicking the Goto block, the From block is unmarked with the purple but the subsystem is still marked in purple and I cannot get rid of it.

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