JBTabbedPane UI replaced after theme switch Follow
Answered
Hello. Would you help me fix a problem
I added a toolwindow by a plugin with JBTabbedPane in it.
When a user switches the theme from Intellij to Darcula and back (or vice-versa), IDE gets side UI instead of my class.
Steps to reproduce:
0. https://github.com/yrakovets/tabbedPaneTest.git
1. task runIDE
2. open project
3. change the theme to Darcula and apply
4. change the theme to Intellij and apply
Expected: JBTabbedPane UI will be similar after 2nd step and after 4th step
Actual : 
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For toolwindows one would usually use builtin functionality for tabs, com.intellij.ui.content.ContentManager#addContent(com.intellij.ui.content.Content) where each Content represents one separate tab. Does it work for you?
I used that class
https://github.com/yrakovets/tabbedPaneTest/blob/master/src/main/java/com/yr/RequestPanelFactory.java
I made the fix for my problem. It doesn't work correctly in the sample, but in my project it does. I "return" the UI back in PropertyChangeListener)
pane.addPropertyChangeListener(evt -> {if (!pane.getUI().equals(ui)) {
pane.setUI(ui);
}
});
The question can be marked as answered, but as for me, IDE behavior is incorrect
This behaviour is expected, on switching look-n-feel every component get UI according to LookAndFeel. So you may override setUI() method and always set your own special UI there instead of original one.