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Calendar: its possible to break the filter ui #6903
Please take special care for the left side of the screenshot. There should have been an entry that has a (+) and a (-) button. But in some cases this entry can be lost and the user is left with (-) button that behaves like a (+) button and without a (-) button in that row.
Unfortunately I was since the initial view of this bug only able to reproduce the bug once and I am still not at a point where I can reliably reproduce the bug. But I thought I could report it anyway, maybe someone else is able to reproduce the bug in a reliable fashion.