[Win32] Table tooltip indexes cell font with subitem -1

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.widgets.*;

/** Reproduce native cell-tooltip handling of a real off-table hit. */
public class TableTooltipBoundsReproducer {
    /** Move only the hidden test window so the last message lies at this point. */
    private static LVHITTESTINFO position(Shell shell, Table table, int x, int y) {
        POINT message = new POINT();
        OS.POINTSTOPOINT(message, OS.GetMessagePos());
        OS.ScreenToClient(table.handle, message);
        RECT bounds = new RECT();
        OS.GetWindowRect(shell.handle, bounds);
        OS.SetWindowPos(shell.handle, 0, bounds.left + message.x - x, bounds.top + message.y - y,
                0, 0, OS.SWP_NOSIZE | OS.SWP_NOZORDER | OS.SWP_NOACTIVATE);
        OS.POINTSTOPOINT(message, OS.GetMessagePos());
        OS.ScreenToClient(table.handle, message);
        LVHITTESTINFO hit = new LVHITTESTINFO();
        hit.x = message.x; hit.y = message.y;
        long row = OS.SendMessage(table.handle, OS.LVM_SUBITEMHITTEST, 0, hit);
        System.out.println("HIT point=" + hit.x + "," + hit.y + " result=" + row + " item=" + hit.iItem + " column=" + hit.iSubItem + " flags=" + hit.flags);
        if (row != 0 || hit.iItem != 0) throw new AssertionError("Expected actual first-row hit");
        return hit;
    }

    /** Invoke the table's actual native notification path, with no hit-test hook. */
    private static void notify(Table table) {
        NMTTDISPINFO info = new NMTTDISPINFO();
        info.hwndFrom = OS.SendMessage(table.handle, OS.LVM_GETTOOLTIPS, 0, 0);
        info.code = OS.TTN_GETDISPINFO;
        long memory = OS.HeapAlloc(OS.GetProcessHeap(), OS.HEAP_ZERO_MEMORY, NMTTDISPINFO.sizeof);
        if (memory == 0) throw new AssertionError("Notification allocation failed");
        try {
            OS.MoveMemory(memory, info, NMTTDISPINFO.sizeof);
            OS.SendMessage(table.handle, OS.WM_NOTIFY, 0, memory);
        } finally { OS.HeapFree(OS.GetProcessHeap(), 0, memory); }
    }

    /** Verify failure, localized tooltip suppression, restoration and valid hits. */
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        Font font = new Font(display, "Segoe UI", 10, SWT.BOLD);
        try {
            shell.setSize(800, 400);
            Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION | SWT.NO_SCROLL);
            table.setBounds(0, 0, 600, 250);
            table.setHeaderVisible(true);
            for (int i = 0; i < 22; i++) {
                TableColumn column = new TableColumn(table, SWT.NONE);
                column.setText("Column " + i);
                column.setWidth(80);
                column.setToolTipText("Header tooltip " + i);
            }
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText(0, "Search row");
            for (int i = 0; i < 22; i++) item.setFont(i, font);
            int y = table.getHeaderHeight() + table.getItemHeight() / 2;
            for (boolean suppress : new boolean[] { false, true, false }) {
                table.setToolTipText(suppress ? "" : null);
                LVHITTESTINFO hit = position(shell, table, -10, y);
                if (hit.iSubItem != -1) throw new AssertionError("Expected actual negative column");
                try {
                    notify(table);
                    if (!suppress) throw new AssertionError("Expected original tooltip exception");
                    if (!"Header tooltip 0".equals(table.getColumn(0).getToolTipText())) throw new AssertionError("Header tooltip changed");
                    System.out.println("PASS suppressed native cell tooltip; header tooltip retained");
                } catch (ArrayIndexOutOfBoundsException e) {
                    if (suppress || !e.getStackTrace()[0].getMethodName().equals("fontHandle")) throw e;
                    System.out.println("PASS baseline actual native failure: " + e);
                    for (int i = 0; i < Math.min(9, e.getStackTrace().length); i++) System.out.println("  at " + e.getStackTrace()[i]);
                }
            }
            LVHITTESTINFO valid = position(shell, table, 10, y);
            if (valid.iSubItem != 0) throw new AssertionError("Valid cell missing");
            notify(table);
            System.out.println("PASS valid in-table native cell notification");
        } finally { shell.dispose(); font.dispose(); display.dispose(); }
    }
}