compare-windows-ignores-space: preference variable

Default value: 2

This variable says whether the compare-windows command should consider any run of one or more whitespace characters in one buffer to match a run of one or more whitespace characters in the other. If 0, it doesn't, and requires all characters to match. If 1, it merges runs of spaces, tabs and newlines. If 2, it merges runs of spaces and tabs only. If 3, it completely ignores differences of only spaces, tabs, and newlines, so abcdef matches abc def. If 4, it completely ignores differences of only spaces and tabs, but not newlines.

More info:

Comparing Two Buffers

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