+ fixes #0001237: the project file is not saved when the /tmp directory is full, but the user is not aware of it

src/App/Document.cpp

@@ -1075,6 +1075,10 @@ bool Document::save (void)
             // write additional files
             writer.writeFiles();
 
+            if (writer.hasErrors()) {
+                throw Base::FileException("Failed to write all data to file", tmp);
+            }
+
             GetApplication().signalSaveDocument(*this);
         }