The text was not getting selected on adding the `TextField` to the scene initially, subsequently removing and adding the `TextField` to the scene selects the entire text present in the `TextField`.
Made changes in the `TextFieldBehavior` constructor to select the text on adding the `TextField`. Added unit test to validate the fix ------------- Commit messages: - Fix textfield selection issue Changes: https://git.openjdk.org/jfx/pull/1446/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1446&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8273657 Stats: 25 lines in 2 files changed: 25 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1446.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1446/head:pull/1446 PR: https://git.openjdk.org/jfx/pull/1446
