"#syncModel(..)" METHOD manages the "#model.getSize()" to know how many rows should be appended as CHILD in the GRID

If the GRID is PAGING "#inPaging", show/refreshing data SHOULD not affect "#model.getSize()", but only UPTO the PAGING SIZE:
actually the var "#newsz", "#oldsz" works on the ENTIRE "#model.getSize()", doing MORE WORK then necessary

If the PAGE size is 20 and the "#model.getSize()" is 50.000 the a refresh will cause a LOT of work (up to one minute):
it'a a BUG... it appends 50.000 children to the GRID instead of 20 (the PAGE SIZE):
if the model.getSize() is 5milion, it no more works...

at "#while (--cnt >= 0) {" it loops to REMOVE extra GRID record children:
it's usefull because maybe the GRID before WAS NOT PAGING

// BUG FIX START
// for (; --newcnt >= 0; ++min) {
//
// if the GRID is PAGING it should work on PAGE size ROWS and not all the rows in the model

int pageLimit = newcnt;
if( inPaging )

{ pageLimit = pageLimit > _grid.getPageSize() ? _grid.getPageSize() : pageLimit; }

for (; --pageLimit >= 0; ++min )

{ // BUG FIX END if (renderer == null) renderer = (RowRenderer) getRealRenderer(); rows.insertBefore(newUnloadedItem(renderer, min), next); }