RFR: 8378377: Remove use of AppContext from JEditorPane [v2]

[Phil Race]

> Remove AppContext from JEditorPane

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8378377

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29855/files
  - new: https://git.openjdk.org/jdk/pull/29855/files/60e13535..c0cb0a30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29855&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29855&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29855.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29855/head:pull/29855

PR: https://git.openjdk.org/jdk/pull/29855