This PR fixes a regression introduced in [JDK-8199592](https://bugs.openjdk.java.net/browse/JDK-8199592), where scene initialization was moved after updating output scales. However, in case of embedded windows (used by `JFXPanel` or `FXCanvas`), the scene has to be initialized before.
A test has been included. Before applying the fix, the JFXPanel is rendered with a garbled image, and after the fix, the rendering is correct. ------------- Commit messages: - Initialize scene of embedded windows before updating output scales, including test Changes: https://git.openjdk.java.net/jfx/pull/364/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=364&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8257719 Stats: 180 lines in 2 files changed: 179 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jfx/pull/364.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/364/head:pull/364 PR: https://git.openjdk.java.net/jfx/pull/364
