Header rowHeader = spreadsheet.getLeftPanel().getRowHeader(row);
JQuery from = rowHeader.getBoundary();
int headerBorder = rowHeader.jq$n().zk().sumStyles("tb", Style.BORDERS);
int yOffset = (newSize + headerBorder) - rowHeader.getHeight();
new JavascriptActions(webDriver)
.mouseOver(from, MouseButton.LEFT)
.mouseDown(from, MouseButton.LEFT)
.mouseMove(from, MouseButton.LEFT)
.mouseMove(from, MouseButton.LEFT, 0, yOffset)
.mouseUp(from, MouseButton.LEFT)