[Win] StyledText with paint artifacts

[tmssngr]

Describe the bug
Resizing a shell with a StyledText control leaves paint artifacts.

To Reproduce
Run this snippet:

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

public class StyledTextExample {

	public static void main(String[] args) {
		final Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		final StyledText styledText = new StyledText(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.MULTI);
		styledText.setText("line 1\nline 2\nline 3\nline 4\n");
		shell.setSize(400, 300);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}

and resize the shell to become larger.

Expected behavior
There must not be repaint artifacts.

Screenshots
Initial display (Windows 11, 175% zoom):

After resizing a little bit:

Environment:

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

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

[Phillipus]

Confirmed at 175% zoom, but not 150% or 200% zoom.

• Windows 11
• Monitor 3840x2160
• Java 21
• Latest SWT commit

[Phillipus]

The artifacts are from the control's border (SWT.BORDER) and are drawn when there are also scroll bars.