RFR: 8294067: [macOS] javax/swing/JComboBox/6559152/bug6559152.java Cannot select an item from popup with the ENTER key. [v4]

[Damon Nguyen]

> The newly fix-sized JComboBox has its dropdown menu opened with this test's mouse click. The goal of the test is to focus the JComboBox, open the dropdown menu, and select the 2nd option of the menu using arrow keys and ENTER key. Since the JComboBox is focused without the click already, the click can be removed.

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Use dimension width and height

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10359/files
  - new: https://git.openjdk.org/jdk/pull/10359/files/e5217e08..d6bd577d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10359&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10359&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10359.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10359/head:pull/10359

PR: https://git.openjdk.org/jdk/pull/10359