RFR: 8233040: Fix: ComboBoxPopupControl - remove eventFilter for F4

Thu Oct 31 15:04:35 UTC 2019

https://bugs.openjdk.java.net/browse/JDK-8233040

The issue is that the eventFilter in CBPC uses F4 for toggling the popup _and_ consumes it. This prevents client code to register there own filter. 

The fix was to remove the block entirely - F4 is already handled by a keyMapping in ComboBoxBehaviorBase. Added test that fails before the change and passes after, old tests are all passing.

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Commits:
 - 2f015406: Fix: ComboBoxPopupControl - remove eventFilter for F4

Changes: https://git.openjdk.java.net/jfx/pull/28/files
 Webrev: https://webrevs.openjdk.java.net/jfx/28/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233040
  Stats: 159 lines in 2 files changed: 153 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/28.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/28/head:pull/28

PR: https://git.openjdk.java.net/jfx/pull/28