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I get different result when I paste with mouse and shift+ins

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https://bbs.archlinux.org – Just to add a little to the above, there really is no universally applied standard (not even close) for how the primary, secondary, and clipboard buffers should be used.  Any X program can use them however they wish.  But there are some common patterns: selected text should be placed in the primary buffer, and X pastes from the primary buffer with either middle click or shift-ins by default.This default can (and unfortunately often is) overriden by clipboard managers - I don't know why they don't stay true to their name and just manage the clipboard buffer, but they often d (HowTos)