Fix resizeable instrument windows being unable to resize

src/gui/instrument/InstrumentTrackWindow.cpp

@@ -272,7 +272,6 @@ InstrumentTrackWindow::InstrumentTrackWindow( InstrumentTrackView * _itv ) :
 	// setup sizes and policies
 	generalSettingsWidget->setMaximumHeight(90);
 	generalSettingsWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
-	vlayout->setSizeConstraint(QLayout::SetFixedSize);
 	m_tabWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 
 	vlayout->addWidget( generalSettingsWidget );
@@ -289,9 +288,13 @@ InstrumentTrackWindow::InstrumentTrackWindow( InstrumentTrackView * _itv ) :
 	if (!m_instrumentView->isResizable()) {
 		flags |= Qt::MSWindowsFixedSizeDialogHint;
 		// any better way than this?
+		setFixedSize(sizeHint());
+		// this should replace that; it does not. Ask Qt why.
+		// Does the same thing, for detached detached windows, for other OSs.
+
 	} else {
-		subWin->setMaximumSize(m_instrumentView->maximumHeight() + 12, m_instrumentView->maximumWidth() + 208);
-		subWin->setMinimumSize( m_instrumentView->minimumWidth() + 12, m_instrumentView->minimumHeight() + 208);
+		subWin->setMaximumSize(m_instrumentView->maximumWidth() + 12, m_instrumentView->maximumHeight() + 208);
+		subWin->setMinimumSize(m_instrumentView->minimumWidth() + 12, m_instrumentView->minimumHeight() + 208);
 	}
 	flags &= ~Qt::WindowMaximizeButtonHint;
 	subWin->setWindowFlags( flags );