CDockWidget::DeleteContentOnClose needs to delete the ScrollArea as well

[AndreMeyerRMC]

Otherwise a second ScrollArea will be created the next time a widget gets set.

diff:

Index: src/DockWidget.cpp
===================================================================
--- src/DockWidget.cpp
+++ src/DockWidget.cpp
@@ -213,6 +213,12 @@
 
 	if (Features.testFlag(CDockWidget::DeleteContentOnClose))
 	{
+		if (ScrollArea)
+		{
+			ScrollArea->takeWidget();
+			delete ScrollArea;
+			ScrollArea = nullptr;
+		}
 		Widget->deleteLater();
 		Widget = nullptr;
 	}

[githubuser0xFFFF]

Thank you for this fix. Please create a pull request.

[AndreMeyerRMC]

fix: #551

[githubuser0xFFFF]

Thank you - merged