Fix bug in CSS caching code that could reset values on unrelated nodes.

The bug occurs due to a cache entry being constructed incorrectly when the 
initial node that triggered the cache entry creation has user set values. The 
calculated values for properties with a user set value were omitted in the 
cache entry, and other nodes that later share the same entry would incorrectly 
assume the omitted property was unstyled and were therefore reset to their 
default values.

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Commit messages:
 - Fix bug in CSS caching code that could reset values on unrelated nodes

Changes: https://git.openjdk.org/jfx/pull/1072/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1072&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8245919
  Stats: 95 lines in 2 files changed: 69 ins; 23 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1072.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1072/head:pull/1072

PR: https://git.openjdk.org/jfx/pull/1072

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