RFR: 8271484: Tree-/TableCell: NPE when accessing edit event from startEdit

[Ajit Ghaisas]

On Thu, 29 Jul 2021 14:11:15 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> The NPE was an indirect effect: 
> 
> - the bug on part of the cell was an incorrect (== missing) edit location in cellEditEvent - that's fixed in this PR
> - a related bug is on part of the implementation of CellEditEvent (assuming that TablePosition != null, [JDK-8269871](https://bugs.openjdk.java.net/browse/JDK-8269871) which is not addressed in this PR
> 
> Fix is to use the cell's state at startEdit for creating the editing location, added tests starting the edit on the cell that failed/passed before/after the fix, also added sanity tests with starting edit on the control that passed before/after.

Marked as reviewed by aghaisas (Reviewer).

The fix looks good to me.

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PR: https://git.openjdk.java.net/jfx/pull/592