rkeen-siemens opened a new issue, #8667:
URL: https://github.com/apache/netbeans/issues/8667
### Apache NetBeans version
Apache NetBeans 26
### What happened
`Utilities.findDialogParent` can return a non-visible component which is
effectively equivalent to null and will cause issues similar to #4739 and #5987.
### Language / Project Type / NetBeans Component
_No response_
### How to reproduce
Run the following code on the EDT:
```java
DialogDescriptor first = new DialogDescriptor("Parent is the main window",
"First");
DialogDisplayer.getDefault().notify(first);
DialogDescriptor second = new DialogDescriptor("Parent is first's dialog",
"Second");
DialogDisplayer.getDefault().notify(second);
```
The first dialog will have the main window as the parent, but the second
will have the dialog created for `first` even though it has been closed.
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Linux
### JDK
21.0.5
### Apache NetBeans packaging
Apache NetBeans platform
### Anything else
Here's what seems to be happening:
1. Closing the first dialog submits a `WINDOW_CLOSED` event to the event
queue
2. Before the event is processed, `notify` opens the second dialog
3. This end up in `DialogDisplayerImpl.AWTQuery.showDialog()` which
ultimately gets the new dialog’s parent using
`org.openide.util.Utilities.findDialogParent`
4. This returns the active window from
`KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow()` which
is still the now closed first dialog because the `WINDOW_CLOSED` event hasn’t
yet been processed
Updating `Utilities.findDialogParent` to resolve a suggested parent via the
closed window's owner would probably resolve the issue. Something like this
after the modal check may work:
```java
if (parent instanceof Window w) {
while (!w.isVisible()) {
w = w.getOwner();
if (w == null) {
break;
}
}
parent = w;
}
```
### Are you willing to submit a pull request?
No
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