RFR: 6201035: Undefined behavior of MatteBorder Ctors [v2]

[Prasanta Sadhukhan]

> The behavior of MatteBorder constructors taking Insets object as a parameter is undocumented. It would throw NPE if null object is passed to it, which should be documented in the spec.

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

  Review comment fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10740/files
  - new: https://git.openjdk.org/jdk/pull/10740/files/6b82bab3..dd44d401

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10740&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10740&range=00-01

  Stats: 6 lines in 2 files changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10740.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10740/head:pull/10740

PR: https://git.openjdk.org/jdk/pull/10740