RFR: 8237469: CssStyleHelper reuse check fixed

[Dean Wookey]

Everything passes with the fix and 5 of the new tests fail without the fix.

removingThenAddingNodeToDifferentBranchGetsNewFontStyleTest
movingBranchToDifferentBranchGetsNewCssVariableTest
removingThenAddingNodeToDifferentBranchGetsCorrectInheritedValue
removingThenAddingNodeToDifferentBranchGetsIneritableStyle
movingNodeToDifferentBranchGetsNewFontStyleTest

I doubt this will cause a significant performance decrease. I think it's worth it for correctness. The only other thing is that I kept the fix to the minimum, but technically canReuseHelper now has a side effect. I could try rewrite some things if necessary, or maybe rename the method? Else leave it as is?

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Commits:
 - 0749dde7: 8237469: Fixed whitespace issues
 - 4e696401: 8237469: CssStyleHelper reuse check fixed

Changes: https://git.openjdk.java.net/jfx/pull/87/files
 Webrev: https://webrevs.openjdk.java.net/jfx/87/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8237469
  Stats: 606 lines in 2 files changed: 603 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/87.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/87/head:pull/87

PR: https://git.openjdk.java.net/jfx/pull/87