The tests that are modified in this PR set a stylesheet using API `StyleManager.getInstance().setDefaultUserAgentStylesheet()`. This is a global state and should be reset after execution of each test. It does not cause any test failures currently, but this has caused a test failure in past reported here [JDK-8239822](https://bugs.openjdk.java.net/browse/JDK-8239822) which was fixed with a similar change like in this PR.
A reset method like following seems sufficient to undo the changes made by `StyleManager.getInstance().setDefaultUserAgentStylesheet()`. But this fix uses the same method definition of `resetStyleManager()` like in the [fix](https://git.openjdk.java.net/jfx/commit/c3ee1a30) for [JDK-8239822](https://bugs.openjdk.java.net/browse/JDK-8239822) private static void resetStyleManager() { StyleManager sm = StyleManager.getInstance(); sm.platformUserAgentStylesheetContainers.clear(); sm.hasDefaultUserAgentStylesheet = false; } Fix also has 2 cleanup changes, 1. A minor typo correction in code, `StyleManager.getInstance().getInstance()` is replaced with `StyleManager.getInstance()`. 2. In test file _HonorDeveloperSettingsTest.java_: Unused class `TestWindow` is removed and few line of commented out code(which used the TestWindow class) is removed. ------------- Commit messages: - reset StyleManager after test execution Changes: https://git.openjdk.java.net/jfx/pull/470/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=470&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8239880 Stats: 71 lines in 4 files changed: 48 ins; 10 del; 13 mod Patch: https://git.openjdk.java.net/jfx/pull/470.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/470/head:pull/470 PR: https://git.openjdk.java.net/jfx/pull/470
