1. Start gnumeric.
2. Enter some data in some cell.
3. Use the window manager's "close window" command.
4. Click the cancel button.

The window disappears.  It should remain visible since the user
canceled the close operation.

Any changes the user made appear to be lost.

Note that if you change step 3 to "Do File Menu->Close", then this bug
does not occur.  Also if you Do "File menu->Exit", the bug does not
occur.  The bug does occur if you close the window through the window
manager.  When I use KDE, all of my X-windows applications have a
button in the upper right corner with a picture of a X.  I click that
button in step 3.  I believe that some window managers display this
button with a different icon.  Also, I think that other window
managers require a double click to close a window.  So reproducing
this might not be exactly the same for you.

Note that this bug also occurs in gnumeric 0.72, but *not* in 0.71