RFR: 6441373: Editing JTable is not Serializable

[Sergey Bylokhov]

The patch implements serialization for editable JTables. Currently, most classes responsible for JTable editing are not serializable, so trying to serialize them causes an exception. The patch has two parts:

 - The editable JTable is reset to non-editable using the common pattern stopCellEditing + cancelCellEditing. This is added to the compWriteObjectNotify method, which acts as an entry point for serialization of Swing components. It allows actions to be performed before the parent classes are serialized.

 - The editing coordinates for all JTables are reset to -1. Before this patch, even non-editable JTables had their coordinates reset to 0 from -1 because the fields were transient.

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Commit messages:
 - 6441373: Editing JTable is not Serializable

Changes: https://git.openjdk.org/jdk/pull/29313/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29313&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6441373
  Stats: 176 lines in 2 files changed: 175 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29313.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29313/head:pull/29313

PR: https://git.openjdk.org/jdk/pull/29313