stopping the Suffix search going up once we hit a seen block #558

Job	Run time
linux/3.8/bare-env	9s
linux/3.12	16m 40s
lint/style-and-typos	37s
osx/3.10	19m 56s
win/3.9	4m 23s
linux/3.11/conda	19m 26s
linux/3.9/mpi	9m 13s
linux/3.10/cython	20m 16s
win/3.8/pip	27m 9s
process-coverage-${{ matrix.TARGET }}	1s
	1h 57m 50s

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