minimizing group in ofxPanel breaks the layout...

Not sure if it's a bug because I do not used this method previously...

...
    //adding params to group
    params_Timeline.add(text_ZoomTimeline);
    params_Timeline.add(SHOW_AllPlots);

    //adding groups (nested) to main group
    params_TextPlayer.add(params_Slides);
    params_TextPlayer.add(params_Player);
    params_TextPlayer.add(params_PlayerGlobal);
    params_TextPlayer.add(params_Modes);
    params_TextPlayer.add(params_Timeline);

    //setup panel
    gui_TextPlayer.setup("TEXT PLAYER");
    //add all nested groups
    gui_TextPlayer.add(params_TextPlayer);

   //minimize any group
   //gui_TextPlayer.getGroup("PLAYER").minimize();//BUG
   //gui_TextPlayer.getGroup("SLIDES").minimize();//BUG
   //gui_TextPlayer.getGroup("MODES").minimize();//BUG
   gui_TextPlayer.getGroup("TIMELINE").minimize();//BUG
   //gui_TextPlayer.getGroup("TEXT PLAYER").minimize();//BUG

I have this nested groups inside the panel:

When adding minimizing any group, layout brokes...
Minimized group draws another '+' on the left and it duplicates the header above..

(I used some custom font and sizes when creating the gui)

Reproduce the nested-group example using ofxPanel setup, add, getGroup, and minimize, including the custom font and sizes mentioned. Trace the layout behavior when TIMELINE or another nested group is minimized; done means the minimized group has one header and one '+' control without breaking the surrounding layout.