demos/spreadsheet: context menu missing

Open Spreadsheet demo and right-click on a cell.
A context menu should pop up, but it doesn't.

I've included a trivial patch that seems to solve the problem.
Apply this patch to demos/spreadsheet/spreadsheet.cpp and the context
menu seems to work fine.

Apologies if the patch doesn't cleanly apply; I originally submitted the bug on
via the Trolltech bug tracker and was told to resubmit; I had to copy-paste
and clean up a bit so I might have messed up the spacing.

$ diff -c3 spreadsheet.cpp spreadsheet.cpp.new

• • • spreadsheet.cpp Fri Sep 18 11:22:47 2009
    • spreadsheet.cpp.new Fri Sep 18 11:23:04 2009
      ***************
    • 70,75 ****
    • 70,76 ----
      updateColor(0);
      setupMenuBar();
      setupContents();
      + setupContextMenu();
      setCentralWidget(table);
      statusBar();