Non-existent directories cannot be changed via UI

[ghost]

Description

When a user has deleted a directory that formerly existed as a preference, the PreferencesFX dialog prevents the user from choosing a different directory.

Replicate

Create a PreferencesFX controller with a file selection option, such as:

In the figure, the path c:\cygwin\home\Dave used to exist, but no longer exists.

Click Browse to change the directory.

Expected

The file picker dialog appears, allowing the user to choose a different directory. Since the initial directory doesn't exist, the default should be set to something reasonable (such as System.getProperty( "user.home" )).

Actual

No dialog appears.

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Folder parameter must be a valid folder
        at javafx.graphics/com.sun.glass.ui.CommonDialogs.convertFolder(Unknown Source)
        at javafx.graphics/com.sun.glass.ui.CommonDialogs.showFolderChooser(Unknown Source)
        at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.showDirectoryChooser(Unknown Source)
        at javafx.graphics/javafx.stage.DirectoryChooser.showDialog(Unknown Source)
        at com.dlsc.preferencesfx.formsfx.view.controls.SimpleChooserControl.lambda$initializeParts$0(SimpleChooserControl.java:143)

Full stack trace is attached.

preferences-fx.txt

Work around

Applications must first verify that each directory exists before allowing PreferencesFX to attempt to change it. This is a brittle work around because users may still delete directories while the application is running, which would require a watch dog on the entire system.

System

Using JDK 19 with JavaFX 19 on WIndows 10.