[Win] StyledText with paint artifacts
**Describe the bug**
Resizing a shell with a `StyledText` control leaves paint artifacts.
**To Reproduce**
Run this snippet:
```java
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):
<img width="680" height="515" alt="Image" src="https://github.com/user-attachments/assets/183b3eb4-bc6a-435a-b5e6-5ac5635b3689" />
After resizing a little bit:
<img width="745" height="541" alt="Image" src="https://github.com/user-attachments/assets/1958a2c0-50f5-47c1-9534-64b63ee82f6d" />
**Environment:**
1. Select the platform(s) on which the behavior is seen:
- - [ ] All OS
- - [x] Windows
- - [ ] Linux
- - [ ] macOS
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