[jdk21u-dev] RFR: 8340308: PassFailJFrame: Make rows default to number of lines in instructions

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport d1d824008d1dc70029013820814fd03c40b4e309

Changes: https://git.openjdk.org/jdk21u-dev/pull/1084/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1084&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340308
  Stats: 35 lines in 1 file changed: 34 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1084.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1084/head:pull/1084

PR: https://git.openjdk.org/jdk21u-dev/pull/1084