EDG.NestedSort is not compatible with "columnReordering" attr

[Evan]

This happens when grid.columnReordering attr is turned on.

Suppose there are three columns in the grid - column A, column B, column C. set sorting priority 1 with column A , 2 with B and 3 with C.  and then reorder column, insert column C before B, the sequence changed to A->C->B, but it's still 1->2->3, while it should be 1->3->2.

However this is working well when EDG column dnd is turned on

[Evan]

In [29692]:

Fixes #16037 !strict, make nested sort compatible with the native "columnReordering" attr, thx for the patch from Oliver(IBM, CCLA)!

[Evan]

In [29693]:

Refs #16037 !strict, also back port to 1.6.x and 1.7.x branches