Hide the backend.qt4/5 rcparam deprecation warning in test suite. #10347
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Otherwise, the test suite is spammed by warnings. Note that pytest
explicitly disregards warnings filters (pytest issue 2430) so we can't
just set a filter when resetting the rcparams are reset in the test
suite.
The changes in matplotlib.testing are just there to allow it to be
imported relatively early in the matplotlib import process.
labeling as release critical given the amount of spam on the test suite (if this, or another similar fix, cannot be merged, then we should revert #10282 until a better solution is found).
attn @efiring who first mentioned the issue to me.
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