Add thickness function

src/App/Document.cpp

@@ -345,6 +345,14 @@ void Document::abortTransaction()
     }
 }
 
+bool Document::hasPendingTransaction() const
+{
+    if (d->activeUndoTransaction)
+        return true;
+    else
+        return false;
+}
+
 void Document::clearUndos()
 {
     if (d->activeUndoTransaction)

src/App/Document.h

@@ -208,6 +208,8 @@ public:
     void commitTransaction();
     /// Abort the  actually running transaction. 
     void abortTransaction();
+    /// Check if a transaction is open
+    bool hasPendingTransaction() const;
     /// Set the Undo limit in Byte!
     void setUndoLimit(unsigned int UndoMemSize=0);
     /// Returns the actual memory consumption of the Undo redo stuff.