[Win32] Table: first row partly hidden behind header

[tmssngr]

Describe the bug
It might happen that setting an owner-drawn table a single item it will not become fully visible, hidden behind the table header, though the table is large enough to show it.

To Reproduce

import java.util.ArrayList;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class SingleTableItemBehindHeader {

	public static void main(String[] args) {
		final Display display = new Display();

		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout(SWT.HORIZONTAL));

		final List list = new List(shell, SWT.BORDER);
		list.setItems("First", "Second");

		final java.util.List<String> rows = new ArrayList<>();
		final Table table = new Table(shell, SWT.FULL_SELECTION | SWT.VIRTUAL | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
		table.setHeaderVisible(true);
		final TableColumn column = new TableColumn(table, SWT.LEFT);
		column.setText("Column");
		column.setWidth(350);
		table.addListener(SWT.SetData, event -> {
			final TableItem tableItem = (TableItem)event.item;
			tableItem.setData(rows.get(event.index));
		});
		final Listener listener = event -> {
			switch (event.type) {
			case SWT.MeasureItem -> {
				final String text = (String)event.item.getData();
				final Point size = event.gc.stringExtent(text);
				event.width = size.x + 4;
				event.height = size.y + 4;
			}
			case SWT.PaintItem -> {
				final String text = (String)event.item.getData();
				event.gc.drawString(text, event.x + 2, event.y + 2, true);
			}
			}
		};
		table.addListener(SWT.MeasureItem, listener);
		table.addListener(SWT.PaintItem, listener);

		list.addListener(SWT.Selection, event -> {
			final int index = list.getSelectionIndex();
			switch (index) {
			case 0 -> {
				setTableRows(java.util.List.of("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11"), rows, table);
				table.setSelection(11);
			}
			case 1 -> {
				setTableRows(java.util.List.of("11"), rows, table);
				table.deselectAll();
				table.select(new int[] {0});
			}
			default -> {
				setTableRows(java.util.List.of(), rows, table);
			}
			}
		});

		shell.setSize(600, 200);
		shell.open();

		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}

		display.dispose();
	}

	private static void setTableRows(java.util.List<String> values, java.util.List<String> rows, Table table) {
		rows.clear();
		rows.addAll(values);

		table.setItemCount(rows.size());
		table.clearAll();
	}
}

• run this snippet
• select the "First" row on the left; this will fill the table on the right and select its last item

• select the "Second" row on the left; this will set the table on the right a single item and select it; but this single item it partly hidden behind the header

Expected behavior
After selecting "Second", the first table item should be fully visible

Environment:

1. Select the platform(s) on which the behavior is seen:

• • All OS
• • Windows
• • Linux
• • macOS

2. Additional OS info (e.g. OS version, Linux Desktop, etc)
   Windows 11 25H2

Workaround
None

[tmssngr]

Note, that with the latest master commit 28ddc85 even selecting the last item and making it visible in the "First" step often fails for me.

[tmssngr]

@Phillipus This is the reported bug.