RFR: 6788481: CellEditorListener.editingCanceled is never called [v3]

[Prasanta Sadhukhan]

> When editing of a table cell is canceled, the function editingCanceled of the registered listener CellEditorListener is not called as actionPerformed on ESC key press was not notifying the "cancel" listeners.
> Fix is to handle "Cancel" action in actionPerformed() by forwarding the Cancel message from CellEditor to the delegate so that it can call `AbstractCellEditor.fireEditingCanceled(`) which notifies all listeners of cancel event.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  jcheck issue fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10964/files
  - new: https://git.openjdk.org/jdk/pull/10964/files/3efbfa7b..b9a4bfc8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10964&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10964&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10964.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10964/head:pull/10964

PR: https://git.openjdk.org/jdk/pull/10964