The sample shows behavior of the 'block' clipboard (clipboard:'block' or clipboard:true), which can be characterized as follows:

1) When the copy area is less than the one selected, copied cells are not repeated and fill only the related selected cells.

2) When the copy area is greater than the one selected, copied cells fill not only the selected area but also the related cells nearby.

Click and drag to select. Use ctrl+c and ctrl+v to copy and paste block content.