[jdk11u-dev] RFR: 8346887: DrawFocusRect() may cause an assertion failure

[Satyen Subramaniam]

Backporting JDK-8346887: DrawFocusRect() may cause an assertion failure. Minor change that adds an additional check before running an assertion for windows. Ran GHA Sanity Checks and local Tier 1 and Tier 2 tests. Patch is clean.

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Commit messages:
 - Backport 8eddf67

Changes: https://git.openjdk.org/jdk11u-dev/pull/2985/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2985&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346887
  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2985.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2985/head:pull/2985

PR: https://git.openjdk.org/jdk11u-dev/pull/2985