RFR: 8352793: Open source several AWT TextComponent tests - Batch 1 [v2]

[Tejesh R]

> Open source these AWT TextComponent tests:
> 
> java/awt/TextComponent/BackgroundTest/BackgroundTest.java
> java/awt/TextComponent/DisableTest/DisableTest.java
> java/awt/TextComponent/TextFieldMargin/TextFieldMargin.java
> java/awt/TextComponent/ModifiersTest/ModifiersTest.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/24656/files
  - new: https://git.openjdk.org/jdk/pull/24656/files/9e007c49..bfcc025b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24656&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24656&range=00-01

  Stats: 5 lines in 2 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/24656.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24656/head:pull/24656

PR: https://git.openjdk.org/jdk/pull/24656