A DESCRIPTION OF THE PROBLEM :
I suggest to add feature that allows to get only single resize event when user releases left mouse button. For example the following solution

stage.titleProperty().bind(
        scene.widthProperty().asString().
        concat(" : ").
        concat(scene.heightProperty().asString()));

When user clicks mouse left button and starts resizing the stage we will get very many events (using property listeners) while he does resizing. However, in many cases it is necessary to get only one event - when the user completes resizing and releases mouse left button. This issue was discussed here https://stackoverflow.com/questions/44159794/get-single-stage-resize-event-when-user-releases-left-mouse-button