GDI+ stability fixes for the benchmark and tests#835

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JimBobSquarePants merged 1 commit intoSixLabors:masterfrom

Lakritzator:master

Feb 15, 2019

Commits on Feb 15, 2019

Some changes to make the usages of GDI in benchmarks and tests more stable, this should hopefully prevent "a generic error occurred in GDI+". Hopefully I didn't miss one...
Lakritzator
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