Matrix specific menu options not automatically displayed when loading project

[Dan Nixon]

Found when testing #7586

When loading a Mantid project where the active window is a matrix the top menu options usually associated with a metrix window (Matrix, Analysis, etc.) are not displayed.

The only way to gain access to them seems to be to switch to a window of a different type and switch back to the matrix or open a new matrix and immediately close it.

This can be reproduced by:

• Create a new workspace with a single matrix
• Save the project and close Mantid
• Open Mantid and load the project
• Notice that the matrix window is the active window within Mantid but the menu bar shows the default options

[Nick Draper]

Moved to the backlog at the code freeze of R3.3

[Stuart Campbell]

This ticket has been transferred to github issue ​10777