exporting patch:
# HG changeset patch
# User Daniel J Sebald <address@hidden>
# Date 1528998934 18000
#      Thu Jun 14 12:55:34 2018 -0500
# Node ID 197a61ed61ad1414b4a8c51da85fc8abe8551b00
# Parent  fa66d81d0956b2176b3f254550069bac14eda02b
Restore detaching GUI panels from QMainWindow when undocking (bug #54078)

* octave-dock-widget.cc (octave_dock_widget::make_window): Remove the comment
  characters for the line dated 3/20/18.

diff --git a/libgui/src/octave-dock-widget.cc b/libgui/src/octave-dock-widget.cc
--- a/libgui/src/octave-dock-widget.cc
+++ b/libgui/src/octave-dock-widget.cc
@@ -259,7 +259,7 @@ namespace octave
     // decorations, e.g., no taskbar icon and always in front
     if (isFloating ())
       setFloating (false);
-// Remove after thorough testing 3/20/18    m_parent->removeDockWidget (this);
+    m_parent->removeDockWidget (this);
     setParent (0, Qt::Window | Qt::CustomizeWindowHint | Qt::WindowTitleHint |
                Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);