[Rd] custom strip in lattice ignoring plotmath expressions for all (PR#8734)

[btyner at gmail.com]

Sorry, so used to it being bundled that I didn't realize lattice was a 
"contributed package".

Ben

Deepayan Sarkar wrote:

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>1. Bugs in packages should be reported to the maintainer, not R-bugs.
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>2. This already works as it should in R 2.3.0 alpha
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>-Deepayan
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