That icon will be a black ≈ ("almost equal") symbol, two wavy lines, when a "Rules-based comparison" has detected only unimportant differences. If it is blank, only a quick test has been run if there is an icon, a contents test has also been run. You can see whether a "quick" or "contents" comparison has been run for any pair of files in a folder-compare window by looking at the middle column. It is quick because it does not open nor read the files so if quickness is what you desire in a comparison, it cannot be rules-based. By doing so, the folder comparison automatically scans all file contents, I don't have to open each one individually.Ī "quick test", by definition, is based solely on directory information like timestamp and size. Therefore, you must set the "Compare contents" checkbox under the "Requires opening files" section. BC3 can't know if line endings are the only difference (for example) unless it scans the contents for line endings. To perform a comparison that ignores unimportant differences, it is necessary to compare the file contents. This answer describes the behavior of 3.3.4 (and 3.3.8) for Windows 32-bit, which seems to automatically report folder results as if I'd opened each file, as long as I have my session settings correct.
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