RFR: JDK-8269921 TextFlow: listeners on bounds can throw NPE while computing text bounds [v4]

[Kevin Rushforth]

On Tue, 26 Sep 2023 08:46:33 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> @FlorianKirmaier this one fell off my radar. The updated fix seems fine as long the check for null `runs` isn't making some other problem. Btw, the title of the bug doesn't match the problem being fixed, so I recommend changing it to something like "TextFlow: listeners on bounds can throw NPE while computing text bounds".
>
> @kevinrushforth 
> I guess it also fell under my radar too.
> 
> I've merged the branch with master!
> I also changed the title as suggested.
> 
> **Testing:**
> I've extensively tested the Change since the PR was created.
> All JPro versions use this bugfix, and a very big Desktop application uses these fixes.
> So I'm sure this doesn't cause any instability.

@FlorianKirmaier As a reminder, this PR is ready for you to `/integrate`

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PR Comment: https://git.openjdk.org/jfx/pull/564#issuecomment-1830847384