RFR: 8341072: Open source several AWT Canvas and Rectangle related tests [v2]

[Tejesh R]

> Open source these AWT Canvas and Rectangle tests:
> java/awt/Canvas/MultiDitherTest/MultiDitherTest.java
> java/awt/Canvas/MultiGraphicsTest/MultiGraphicsTest.java
> java/awt/Canvas/NoEventsLeakTest/NoEventsLeakTest.java
> java/awt/Rectangle/IntersectionTest/IntersectionTest.java

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Updated review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21464/files
  - new: https://git.openjdk.org/jdk/pull/21464/files/f83d7105..fec22ac6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21464&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21464&range=00-01

  Stats: 11 lines in 3 files changed: 0 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21464.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21464/head:pull/21464

PR: https://git.openjdk.org/jdk/pull/21464