Issue: Calling MTLTexture.update() method on a disposed MTLTexture object would cause a crash. The root cause of this behavior is [JDK-8368629](https://bugs.openjdk.org/browse/JDK-8368629).
Fix: Avoid MTLTexture.update() if texture is disposed. The crash should be fixed now and the root cause will be followed up using [JDK-8368629](https://bugs.openjdk.org/browse/JDK-8368629) ------------- Commit messages: - avoid MTLTexture.update if disposed Changes: https://git.openjdk.org/jfx/pull/1919/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1919&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8368631 Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1919.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1919/head:pull/1919 PR: https://git.openjdk.org/jfx/pull/1919
