Problems with WITHOUT ROWID tables with PK of string type

This fixes two related problems:
- When the PK is updated the hidden column 0 must be updated too,
  otherwise any further editing of the same row before a table refresh is
  broken.
- When a new record is inserted and the PK has string type we cannot
  simply make a pseudo auto-increment and insert that value as rowid
  because that added key would be impossible to update because our
  UPDATE clause will try to update a column with a string and it contains
  an integer. In this case it's better to let the user enter the PK value,
  so the new Add Record dialog is directly invoked.

See issue #1332 and (tangentially) #1049. The first should be fixed now.
The later not, but at least there is now a workaround: removing the
AUTOINCREMENT option and use the WITHOUT ROWID one.

src/MainWindow.cpp

@@ -775,11 +775,13 @@ void MainWindow::closeEvent( QCloseEvent* event )
 void MainWindow::addRecord()
 {
     int row = m_browseTableModel->rowCount();
-    if(m_browseTableModel->insertRow(row))
+    bool isWithoutRowidTable = db.getObjectByName(currentlyBrowsedTableName())->type() == sqlb::Object::Table && db.getObjectByName<sqlb::Table>(currentlyBrowsedTableName())->isWithoutRowidTable();
+
+    if(!isWithoutRowidTable && m_browseTableModel->insertRow(row))
     {
         selectTableLine(row);
     } else {
-        // Error inserting empty row.
+        // Table without rowid (let user enter value for PK) or error inserting empty row.
         // User has to provide values acomplishing the constraints. Open Add Record Dialog.
         insertValues();
     }

src/sqlitetablemodel.cpp

@@ -393,6 +393,12 @@ bool SqliteTableModel::setTypedData(const QModelIndex& index, bool isBlob, const
         {
             cached_row.replace(index.column(), newValue);
             lock.unlock();
+            // Special case for rowid columns
+            if(m_headers.at(index.column()) == m_sRowidColumn) {
+                cached_row.replace(0, newValue);
+                const QModelIndex& rowidIndex = index.sibling(index.row(), 0);
+                emit dataChanged(rowidIndex, rowidIndex);
+            }
             emit dataChanged(index, index);
             return true;
         } else {