Avoid stack overflow in filterFilter when using objects containing circular references

[timschlechter]

When an object with a circular reference property is passed into the search function, a stack overflow occurs. This patch fixes this by processing only calls to objects not processed yet.

[mary-poppins]

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• Uses the issue template (#7751)

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[mary-poppins]

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[timschlechter]

Ah, of course. I just submitted the CLA form

[mary-poppins]

CLA signature verified! Thank you!

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[caitp]

This is a dupe of #6319

[timschlechter]

Ah, you're right. Closing this one.