Not necessarily contiguous. E.g. you have a track for bass guitar part and you have several clips there, so that during some part of the song bass is not playing. Then, when you change your song, you rethink the bass part and you actually want bass all the time. So instead of adding yet another clip you merge all the existing clips into one so that all MIDI events stay at their original place and the place between them is "filled with silence" :-)
Merging clips from several tracks might be useful too. In that case Qtractor should merge clips into the first selected track/clip. Or maybe have an option for that, though it most likely will make UI clumsey and bloated.
Not necessarily contiguous. E.g. you have a track for bass guitar part and you have several clips there, so that during some part of the song bass is not playing. Then, when you change your song, you rethink the bass part and you actually want bass all the time. So instead of adding yet another clip you merge all the existing clips into one so that all MIDI events stay at their original place and the place between them is "filled with silence" :-)
Merging clips from several tracks might be useful too. In that case Qtractor should merge clips into the first selected track/clip. Or maybe have an option for that, though it most likely will make UI clumsey and bloated.