Floating QDockWidgets (e.g. the script interpreter window) appear before the main window

[mantid-builder]

Original Reporter: Russell Taylor

Quoting Nick:

I’ve noticed that if you undock the ipython window that it appears really quickly on startup, way before the rest of the GUI, in fact it often covers up the splash screen.

In fact, this is not specific to the interpreter window - it is true of all the QDockWidgets (log window, algorithm & workspace lists, ...).

[mantid-builder]

This issue was originally trac ticket 8259