[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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Document: cubicweb-doc

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Title: CubicWeb Documentation

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Author: Logilab

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Abstract: Some base documentation for CubicWeb users and developpers

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Section: Apps/Programming

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Format: HTML

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Index: /usr/share/doc/python-cubicweb-documentation/html/index.html

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Files: /usr/share/doc/python-cubicweb-documentation/html/*