git: openjdk/jfx: master: 8252935: Add treeShowing listener only when needed

[Kevin Rushforth]

Changeset: 47338244
Author:    John Hendrikx <jhendrikx at openjdk.org>
Committer: Kevin Rushforth <kcr at openjdk.org>
Date:      2021-02-20 14:11:38 +0000
URL:       https://git.openjdk.java.net/jfx/commit/47338244

8252935: Add treeShowing listener only when needed

Reviewed-by: kcr, arapte

! modules/javafx.controls/src/main/java/javafx/scene/control/skin/ProgressIndicatorSkin.java
! modules/javafx.graphics/src/main/java/com/sun/javafx/scene/NodeHelper.java
+ modules/javafx.graphics/src/main/java/com/sun/javafx/scene/TreeShowingExpression.java
! modules/javafx.graphics/src/main/java/javafx/scene/Node.java
! modules/javafx.graphics/src/main/java/javafx/scene/SubScene.java
! modules/javafx.graphics/src/main/java/javafx/stage/PopupWindow.java
+ modules/javafx.graphics/src/test/java/test/javafx/scene/TreeShowingExpressionTest.java
+ tests/system/src/test/java/test/javafx/scene/NodeTreeShowingTest.java