Fix crash loading style from postgres db when there is no "layer_styles" table in the database

Fix #20155 -crash loading style from postgres db when there is no "layer_styles" table in the database

Author: elpaso

src/app/qgsvectorlayerloadstyledialog.cpp

@@ -128,9 +128,10 @@ QString QgsVectorLayerLoadStyleDialog::filePath() const
 
 void QgsVectorLayerLoadStyleDialog::initializeLists( const QStringList &ids, const QStringList &names, const QStringList &descriptions, int sectionLimit )
 {
+  // -1 means no ids
   mSectionLimit = sectionLimit;
   int relatedTableNOfCols = sectionLimit > 0 ? 2 : 1;
-  int othersTableNOfCols = ids.count() - sectionLimit > 0 ? 2 : 1;
+  int othersTableNOfCols = ( sectionLimit >= 0 && ids.count() - sectionLimit > 0 ) ? 2 : 1;
   QString twoColsHeader( QStringLiteral( "Name;Description" ) );
   QString oneColsHeader( QStringLiteral( "No styles found in the database" ) );
   QString relatedTableHeader = relatedTableNOfCols == 1 ? oneColsHeader : twoColsHeader;
@@ -141,24 +142,27 @@ void QgsVectorLayerLoadStyleDialog::initializeLists( const QStringList &ids, con
   mRelatedTable->setHorizontalHeaderLabels( relatedTableHeader.split( ';' ) );
   mOthersTable->setHorizontalHeaderLabels( othersTableHeader.split( ';' ) );
   mRelatedTable->setRowCount( sectionLimit );
-  mOthersTable->setRowCount( ids.count() - sectionLimit );
+  mOthersTable->setRowCount( sectionLimit >= 0 ? ( ids.count() - sectionLimit ) : 0 );
   mRelatedTable->setDisabled( relatedTableNOfCols == 1 );
   mOthersTable->setDisabled( othersTableNOfCols == 1 );
 
-  for ( int i = 0; i < sectionLimit; i++ )
+  if ( sectionLimit > 0 )
   {
-    QTableWidgetItem *item = new QTableWidgetItem( names.value( i, QString() ) );
-    item->setData( Qt::UserRole, ids[i] );
-    mRelatedTable->setItem( i, 0, item );
-    mRelatedTable->setItem( i, 1, new QTableWidgetItem( descriptions.value( i, QString() ) ) );
-  }
-  for ( int i = sectionLimit; i < ids.count(); i++ )
-  {
-    int j = i - sectionLimit;
-    QTableWidgetItem *item = new QTableWidgetItem( names.value( i, QString() ) );
-    item->setData( Qt::UserRole, ids[i] );
-    mOthersTable->setItem( j, 0, item );
-    mOthersTable->setItem( j, 1, new QTableWidgetItem( descriptions.value( i, QString() ) ) );
+    for ( int i = 0; i < sectionLimit; i++ )
+    {
+      QTableWidgetItem *item = new QTableWidgetItem( names.value( i, QString() ) );
+      item->setData( Qt::UserRole, ids[i] );
+      mRelatedTable->setItem( i, 0, item );
+      mRelatedTable->setItem( i, 1, new QTableWidgetItem( descriptions.value( i, QString() ) ) );
+    }
+    for ( int i = sectionLimit; i < ids.count(); i++ )
+    {
+      int j = i - sectionLimit;
+      QTableWidgetItem *item = new QTableWidgetItem( names.value( i, QString() ) );
+      item->setData( Qt::UserRole, ids[i] );
+      mOthersTable->setItem( j, 0, item );
+      mOthersTable->setItem( j, 1, new QTableWidgetItem( descriptions.value( i, QString() ) ) );
+    }
   }
 }