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side_diff: fix the column layout overflow and `--expand-tabs` #671

Job	Run time
Build the fuzzers	36s
Run the fuzzers (fuzz_cmp, true)	1m 43s
Run the fuzzers (fuzz_cmp_args, true)	1m 50s
Run the fuzzers (fuzz_patch, true)	1m 43s
Run the fuzzers (fuzz_ed, true)	1m 34s
Run the fuzzers (fuzz_side, true)	1m 42s
Run the fuzzers (fuzz_normal, true)	1m 32s
	10m 40s