I was looking at it from Beats (position, length, rate) standpoint, where the following diagnosis appears to still apply, unfortunately.
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When moving or copying regions, REAPER keeps the start points of the underlying MIDI or audio sources aligned.
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Looks like it's based on absolute time in seconds, rather than a number of measures/beats. So, if you copy a region which starts on measure two of an item, then extend that item's left edge backwards, it will not be exactly one measure where the start of source is found.
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I think it is safer to always keep "Allow trim" enabled.
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Agreed. Actually, essential, I would say.
It *should be* like ripping/copying a page out of a score and inserting it between some other pages. [edit: I mean regardless of "Allow trim..."] Cut, Copy, Paste, and corresponding mouse drags work ok, on selected (time selection) portion of selected items in the same situation. i.e time selection at the region boundaries.