The problem is that when you have a QTableWidget table that contains one or more rows with multiple column spans and you try to delete or insert a row before the row with the column span, the table will fail to shift the spanned row up (if deleting a row) or down (if inserting a new row). The contents of the row
will get shifted correctly, but not the column span. Qt3 did not have this problem.

Here is some code that shows the problem:

#include <QtGui/QtGui>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

int ROWS = 10;
int COLS = 10;

//create empty 10x10 table
QTableWidget table(ROWS, COLS);
for (int i=0; i<ROWS; i++)

{ for (int j=0; j<COLS; j++) table.setItem(i, j, new QTableWidgetItem("")); }

//set multiple column span and text for row #5 (i.e., row index = 4)
int row = 4;
int col = 0;
int ROWSPAN = 1;
table.setSpan(row, col, ROWSPAN, COLS);
table.item(row, col)->setText("This is a multiple column span ...");

//Delete first row to unveil the problem.
//After deleting the first row, row #4 (and not row #5) should contain the multiple column span.
table.removeRow(0);

table.show();
return app.exec();
}

Expected to see:
I expected to see row #4 (not row #5) displayed as a multiple column span row.

Got instead:
Instead I got a table with row #5 displayed as a multiple column span row.
The problem is that the QTableWidget class does not account for a change in
the number of rows, when it happens above a row that contains a multiple
column span. The text of the spanned row gets shifted correctly, but not the
column span itself.