Gnats 4702: SCT: Reproducible crash while entering slot data
   (same as Gnats 4698, but for the SCT).

Fixed in 5.1 Builds and 4.0.9 (future) Prerel on 2-17-2009 [Phil]

GNATS 4702 RECORD ... GNATS 4698 RECORD ... SEE ALSO ERROR DIALOG BOX

This assertion error (crash) is avoidable by recoding Trolltech's
recommended "hack" to make the cells of a Q3Table "itemless".

The table does need to store ONE temporary cell widget: the QLineEdit
used for incell editing.  The "hack" solution uses an "auto-delete"
enabled structure: Q3IntDict, with these implementations:

  Q3IntDict widgets;

  virtual void insertWidget (int r, int c, QWidget *w)
                   { widgets.replace (indexOf (r,c), w); }
  virtual QWidget *cellWidget (int r, int c) const
                   { return widgets.find (indexOf (r,c)); }
  virtual void clearCellWidget (int r, int c)
                   { widgets.remove (indexOf (r,c)); }

I recoded these methods to store a SINGLE cell widget along with indices
for the cell in which it is active.  To avoid the assertion error, the
deletion of incell editor widgets needs to be deferred.  Retired incell
editor widgets are saved in a cwSlist, and are deleted when the dialog
box is closed.

  int      _singleInCellWidgetRow;
  int      _singleInCellWidgetCol;
  QWidget* _singleInCellWidgetPtr;     // ownership.
  cwSlist<QWidget*> _deadCellWidgets;  // delete later

  virtual void insertWidget (int r, int c, QWidget*);
  virtual QWidget* cellWidget (int r, int c) const;
  virtual void clearCellWidget (int r, int c);
  void deleteDeadCellWidgets();

Also, new private Qt "slot"
  void cellLineEdit_destroyed (QObject*);   // private Qt "slot"
  .. Removes obj from cwSlist<QWidget*> _deadCellWidgets, if it's there.

Files:
  QtSCT/SctQTable.hpp
  QtSCT/SctQTable.cpp

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