src/core/src/main/java/org/apache/jmeter/config/gui/ArgumentsPanel.java [439:509]:
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    private void moveDown() {
        //get the selected rows before stopping editing
        // or the selected rows will be unselected
        int[] rowsSelected = table.getSelectedRows();
        GuiUtils.stopTableEditing(table);

        if (rowsSelected.length > 0 && rowsSelected[rowsSelected.length - 1] < table.getRowCount() - 1) {
            table.clearSelection();
            for (int i = rowsSelected.length - 1; i >= 0; i--) {
                int rowSelected = rowsSelected[i];
                tableModel.moveRow(rowSelected, rowSelected + 1, rowSelected + 1);
            }
            for (int rowSelected : rowsSelected) {
                table.addRowSelectionInterval(rowSelected + 1, rowSelected + 1);
            }

            scrollToRowIfNotVisible(rowsSelected[0]+1);
        }
    }


    /**
     * ensure that a row is visible in the viewport
     * @param rowIndex row index
     */
    private void scrollToRowIfNotVisible(int rowIndex) {
        if(table.getParent() instanceof JViewport) {
            Rectangle visibleRect = table.getVisibleRect();
            final int cellIndex = 0;
            Rectangle cellRect = table.getCellRect(rowIndex, cellIndex, false);
            if (visibleRect.y > cellRect.y) {
                table.scrollRectToVisible(cellRect);
            } else {
                Rectangle rect2 = table.getCellRect(rowIndex + getNumberOfVisibleRows(table), cellIndex, true);
                int width = rect2.y - cellRect.y;
                table.scrollRectToVisible(new Rectangle(cellRect.x, cellRect.y, cellRect.width, cellRect.height + width));
            }
        }
    }

    /**
     * @param table {@link JTable}
     * @return number of visible rows
     */
    private static int getNumberOfVisibleRows(JTable table) {
        Rectangle vr = table.getVisibleRect();
        int first = table.rowAtPoint(vr.getLocation());
        vr.translate(0, vr.height);
        return table.rowAtPoint(vr.getLocation()) - first;
    }

    /**
     *  Move a row down
     */
    private void moveUp() {
        //get the selected rows before stopping editing
        // or the selected rows will be unselected
        int[] rowsSelected = table.getSelectedRows();
        GuiUtils.stopTableEditing(table);

        if (rowsSelected.length > 0 && rowsSelected[0] > 0) {
            table.clearSelection();
            for (int rowSelected : rowsSelected) {
                tableModel.moveRow(rowSelected, rowSelected + 1, rowSelected - 1);
            }

            for (int rowSelected : rowsSelected) {
                table.addRowSelectionInterval(rowSelected - 1, rowSelected - 1);
            }

            scrollToRowIfNotVisible(rowsSelected[0]-1);
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src/protocol/http/src/main/java/org/apache/jmeter/protocol/http/gui/HTTPFileArgsPanel.java [426:495]:
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    private void moveDown() {
        //get the selected rows before stopping editing
        // or the selected rows will be unselected
        int[] rowsSelected = table.getSelectedRows();
        GuiUtils.stopTableEditing(table);

        if (rowsSelected.length > 0 && rowsSelected[rowsSelected.length - 1] < table.getRowCount() - 1) {
            table.clearSelection();
            for (int i = rowsSelected.length - 1; i >= 0; i--) {
                int rowSelected = rowsSelected[i];
                tableModel.moveRow(rowSelected, rowSelected + 1, rowSelected + 1);
            }
            for (int rowSelected : rowsSelected) {
                table.addRowSelectionInterval(rowSelected + 1, rowSelected + 1);
            }

            scrollToRowIfNotVisible(rowsSelected[0]+1);
        }
    }

    /**
     * ensure that a row is visible in the viewport
     * @param rowIndex row index
     */
    private void scrollToRowIfNotVisible(int rowIndex) {
        if(table.getParent() instanceof JViewport) {
            Rectangle visibleRect = table.getVisibleRect();
            final int cellIndex = 0;
            Rectangle cellRect = table.getCellRect(rowIndex, cellIndex, false);
            if (visibleRect.y > cellRect.y) {
                table.scrollRectToVisible(cellRect);
            } else {
                Rectangle rect2 = table.getCellRect(rowIndex + getNumberOfVisibleRows(table), cellIndex, true);
                int width = rect2.y - cellRect.y;
                table.scrollRectToVisible(new Rectangle(cellRect.x, cellRect.y, cellRect.width, cellRect.height + width));
            }
        }
    }

    /**
     * @param table {@link JTable}
     * @return number of visible rows
     */
    private static int getNumberOfVisibleRows(JTable table) {
        Rectangle vr = table.getVisibleRect();
        int first = table.rowAtPoint(vr.getLocation());
        vr.translate(0, vr.height);
        return table.rowAtPoint(vr.getLocation()) - first;
    }

    /**
     *  Move a row down
     */
    private void moveUp() {
        //get the selected rows before stopping editing
        // or the selected rows will be unselected
        int[] rowsSelected = table.getSelectedRows();
        GuiUtils.stopTableEditing(table);

        if (rowsSelected.length > 0 && rowsSelected[0] > 0) {
            table.clearSelection();
            for (int rowSelected : rowsSelected) {
                tableModel.moveRow(rowSelected, rowSelected + 1, rowSelected - 1);
            }

            for (int rowSelected : rowsSelected) {
                table.addRowSelectionInterval(rowSelected - 1, rowSelected - 1);
            }

            scrollToRowIfNotVisible(rowsSelected[0]-1);
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