Popup Window for diff results is unresponsive in WSL

- [x] I verified I can reproduce this issue against [latest Integration Build of Eclipse SDK](https://download.eclipse.org/eclipse/downloads/)

## Steps to reproduce

From a fresh installation and clean workspace:

Execute junit test:

```
import org.junit.Assert;
import org.junit.Test;

public class ComparisonTest {
@Test
public void testComparison() {
Assert.assertEquals( "a", "b" );
}
}
```

Doubleclick on "org.junit.ComparisonFailure: expected:<[a]> but was:<[b]>"

**Expected behavior:**
The new popup window showing the diff between the two strings should be responsive.

**Actual behavior:**
The popup window is shown, but it is not responsive. You can't confirm it, close it, move it.

## Here is some relevant log output

[jstack.txt](https://github.com/user-attachments/files/19247012/jstack.txt)

## Tested under this environment:
* Eclipse IDE/Platform version (as shown in *Help > About*): Version: 2025-03 (4.35.0), Build id: 20250306-0812
* WSL-Version: 2.4.12.0
* Kernelversion: 5.15.167.4-1
* WSLg-Version: 1.0.65
* MSRDC-Version: 1.2.5716
* Direct3D-Version: 1.611.1-81528511
* DXCore-Version: 10.0.26100.1-240331-1435.ge-release
* Windows-Version: 10.0.22621.5039

## Community

- [x] I understand reporting an issue to this OSS project does not mandate anyone to fix it. Other contributors may consider the issue, or not, at their own convenience. The most efficient way to get it fixed is that I fix it myself and contribute it back as a good quality patch to the project.

## See also
* https://github.com/eclipse-jdt/eclipse.jdt.ui/issues/2087
* https://github.com/microsoft/wslg/issues/1012