`IS_TRUE_OVERFLOW_CONTAINER` is defined in nsContainerFrame.h, but is already used in several places in `nsIFrame`. It really should be an nsIFrame's method. https://searchfox.org/mozilla-central/source/layout/generic/nsContainerFrame.h#911-918
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`IS_TRUE_OVERFLOW_CONTAINER` [1] is defined in nsContainerFrame.h, but is already used in several places in `nsIFrame`. It really should be an nsIFrame's method. [1] https://searchfox.org/mozilla-central/rev/f21850ca45036ddb84cd25aa355a6969d7c94c4f/layout/generic/nsContainerFrame.h#911-918