[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

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# -*- coding: utf-8 -*-

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# Put here information about external resources / styles used by your cube,

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# or to overides existing UI properties.

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# Existing properties are available through the `sheet` dictionary available

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# in the global namespace. You also have access to a `data` function which

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# will return proper url for resources in the 'data' directory.

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# /!\ this file should not be imported /!\

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# CSS stylesheets to include in HTML headers

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# uncomment the line below to use template specific stylesheet

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# STYLESHEETS = sheet['STYLESHEETS'] + [data('cubes.%(cubename)s.css')]