[jdk17u-dev] RFR: 8236505: Mark jdk/editpad/EditPadTest.java as @headful

[Goetz Lindenmaier]

I backport this for parity with 17.0.3-oracle.

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Commit messages:
 - Backport 7acec3f161234b99da76193781296157b98d689c

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/112/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=112&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8236505
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/112.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/112/head:pull/112

PR: https://git.openjdk.java.net/jdk17u-dev/pull/112