The Help is pretty clear to me, and also describes what I see happening:
But I find the options for the "Search must match:" dropdown list in the "Search filter" dialog misleading and confusing:Help wrote:Meaning of the various options:
1x: Show files when the filter matches on at least one side.
2x: When the filter matches on both sides (dupes), or there is only one file (singles).
<-: The filter must match the file on the left. Do not show files only present on the right.
<+: The filter must match the file on the left. If there is only a file on the right, the filter must match that file.
->: The filter must match the file on the right. Do not show files only present on the left.
+>: The filter must match the file on the right. If there is only a file on the left, the filter must match that file
"on both sides (if present)" - To me this does not clarify that this also applies to a match on only one side, if the other side is not present . It could be read as if both sides has to be present.Search must match:
on at least one side
on both sides (if present)
on the left (if present), leave out files only present on the right side
on the left side, if not present on the right side
on the right (if present), leave out files only present on the left side
on the right side, if not present on the left side
"on the left (if present), leave out files only present on the right side" - I find that "(if present)" is redundant - if the file on the left side is not present, then the second part of the rule applies, so there is no need to write "(if present)"
"on the left side, if not present on the right side" - This one is really misleading to me - I read it as the rule only applies it there is a match on the left side, and at the same time there is no file present on the right side (left single). But the rule is: that either the file on the left side matches, or if there is no file present on the left side (right single), then a match with the file on the right side will apply.
I have given it a lot of thought and suggest something like this instead:
Search must match:
on at least one side
on both sides if present (dupes), or on present side (singles)
on the left side, leave out files only present on the right side
on the left side if present, or on the right side (singles)
on the right side, leave out files only present on the left side
on the right side if present, or on the left side (singles)
Or maybe:
Adding "on at least" to all options, indicates that matches on the file on the opposite side is always allowed.Search must match on at least:
one side
both sides if present (dupes), or else on present side (singles)
the left side, leave out files only present on the right side
the left side if present, or else on the right side (singles)
the right side, leave out files only present on the left side
the right side if present, or else on the left side (singles)