neilcsmith-net commented on PR #7009:
URL: https://github.com/apache/netbeans/pull/7009#issuecomment-1914827280
The bug and fix I linked to in JDK 19 makes the scroll pane react to mouse
wheel events even when no scroll bar is visible. Our code seems to rely on
them never being there to filter out scrolling.
> Fact is that adding an empty mouse wheel listener, already restores the
old behavior on JDK 19+: nothing happens on scroll over the line number bar. I
can't remember of an instance that adding an empty listener did ever change
behavior in swing before!
It's not that unusual that adding a listener filters events being handed up
to the ancestor. See the documentation for `MouseWheelEvent` -
```
* MouseWheelEvents start delivery from the Component underneath the
* mouse cursor. If MouseWheelEvents are not enabled on the
* Component, the event is delivered to the first ancestor
* Container with MouseWheelEvents enabled. This will usually be
* a ScrollPane with wheel scrolling enabled.
```
The fix seems to make sense to me. And also that there is not a JDK bug
involved.
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