JComboBox: support for tail/suffix component inside render

[VISTALL]

Hello. Will be nice have such feature :) Analog of JTextField.trailingComponent

IDEA code https://github.com/JetBrains/intellij-community/blob/master/platform/xdebugger-impl/src/com/intellij/xdebugger/impl/ui/XDebuggerEmbeddedComboBox.java

How its like in IDEA