DockableFrame cannot be garbage collected

[astaravoitau]

Hi,
I'm using JIDE docking framework and after I close any DockableFrame it still stays in memory and cannot be processed by the garbage collector.
Jide version 3.3.5.
When I analyze heap dump using visualvm I see no references pointing to the closed frame. VisualVM says "The instance is a GC root".
Should I perform any clean up work on frame closing action?
Attached is a demo project that demonstrates the issue but in this case frame is not a "GC root". It has a reference in KeyboardFocusManager. But I guess there could be the fix that will solve my original problem also

[JIDE Support]

By closing a dockable frame, do you mean close the frame from UI? If so, that's just a call to dockingManager.hideFrame by default. You will have to call dockingManager.removeFrame to allow it to be gc'ed.