Fixed a bug in _collapse method of SheetPlot
Fixed a bug in _collapse method of SheetPlot

mjabri/holoviews,mjabri/holoviews,vascotenner/holoviews,mjabri/holoviews,vascotenner/holoviews,basnijholt/holoviews,basnijholt/holoviews,ioam/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews