Fix OpenCS crash when drag and drop is used with unexpected data, e.g. plain text (Fixes #1543)

apps/opencs/view/filter/filterbox.cpp

@@ -35,7 +35,11 @@ void CSVFilter::FilterBox::setRecordFilter (const std::string& filter)
 
 void CSVFilter::FilterBox::dropEvent (QDropEvent* event)
 {
-    std::vector<CSMWorld::UniversalId> data = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData())->getData();
+    const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime) // May happen when non-records (e.g. plain text) are dragged and dropped
+        return;
+
+    std::vector<CSMWorld::UniversalId> data = mime->getData();
 
     emit recordDropped(data, event->proposedAction());
 }

apps/opencs/view/render/worldspacewidget.cpp

@@ -120,6 +120,8 @@ void CSVRender::WorldspaceWidget::dragMoveEvent(QDragMoveEvent *event)
 void CSVRender::WorldspaceWidget::dropEvent (QDropEvent* event)
 {
     const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime) // May happen when non-records (e.g. plain text) are dragged and dropped
+        return;
 
     if (mime->fromDocument (mDocument))
     {

apps/opencs/view/world/regionmap.cpp

@@ -382,6 +382,9 @@ void CSVWorld::RegionMap::dropEvent (QDropEvent* event)
     }
 
     const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime) // May happen when non-records (e.g. plain text) are dragged and dropped
+        return;
+
     if (mime->fromDocument(mDocument) && mime->holdsType(CSMWorld::UniversalId::Type_Region))
     {
         CSMWorld::UniversalId record (mime->returnMatching (CSMWorld::UniversalId::Type_Region));

apps/opencs/view/world/scriptedit.cpp

@@ -44,20 +44,37 @@ CSVWorld::ScriptEdit::ScriptEdit (QWidget* parent, const CSMDoc::Document& docum
 }
 
 void CSVWorld::ScriptEdit::dragEnterEvent (QDragEnterEvent* event)
+{
+    const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime)
+        QTextEdit::dragEnterEvent(event);
+    else
     {
         setTextCursor (cursorForPosition (event->pos()));
         event->acceptProposedAction();
     }
+}
 
 void CSVWorld::ScriptEdit::dragMoveEvent (QDragMoveEvent* event)
+{
+    const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime)
+        QTextEdit::dragMoveEvent(event);
+    else
     {
         setTextCursor (cursorForPosition (event->pos()));
         event->accept();
     }
+}
 
 void CSVWorld::ScriptEdit::dropEvent (QDropEvent* event)
 {
     const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime) // May happen when non-records (e.g. plain text) are dragged and dropped
+    {
+        QTextEdit::dropEvent(event);
+        return;
+    }
 
     setTextCursor (cursorForPosition (event->pos()));
 

apps/opencs/view/world/table.cpp

@@ -464,6 +464,9 @@ void CSVWorld::Table::dropEvent(QDropEvent *event)
     }
 
     const CSMWorld::TableMimeData* mime = dynamic_cast<const CSMWorld::TableMimeData*> (event->mimeData());
+    if (!mime) // May happen when non-records (e.g. plain text) are dragged and dropped
+        return;
+
     if (mime->fromDocument (mDocument))
     {
         CSMWorld::ColumnBase::Display display = static_cast<CSMWorld::ColumnBase::Display>

apps/opencs/view/world/tablesubview.cpp

@@ -131,6 +131,9 @@ bool CSVWorld::TableSubView::eventFilter (QObject* object, QEvent* event)
     {
         QDropEvent* drop = dynamic_cast<QDropEvent*>(event);
         const CSMWorld::TableMimeData* data = dynamic_cast<const CSMWorld::TableMimeData*>(drop->mimeData());
+        if (!data) // May happen when non-records (e.g. plain text) are dragged and dropped
+            return false;
+
         bool handled = data->holdsType(CSMWorld::UniversalId::Type_Filter);
         if (handled)
         {

apps/opencs/view/world/util.cpp

@@ -255,6 +255,9 @@ void CSVWorld::DropLineEdit::dragMoveEvent(QDragMoveEvent *event)
 void CSVWorld::DropLineEdit::dropEvent(QDropEvent *event)
 {
     const CSMWorld::TableMimeData* data(dynamic_cast<const CSMWorld::TableMimeData*>(event->mimeData()));
+    if (!data) // May happen when non-records (e.g. plain text) are dragged and dropped
+        return;
+
     emit tableMimeDataDropped(data->getData(), data->getDocumentPtr());
     //WIP
 }