In the Search widget of Carrot2 (3.12.0.0), you can select the disk icon and do a "Save As...". This saves all the attributes of the Search widget (in our case we are using Solr, so it's all the Solr fields), but it doesn't save the Basic Query field (the only required field in the widget). In the image below, all the yellow highlighted fields are saved, but not the "Query (required)" field that is circled.
I've downloaded the source from Git (http://project.carrot2.org/source-code.html), but I don't see how I can update the code to save this value or to even understand why it isn't saved by default.
Any help would be greatly appreciated.
Seems to be a bug in the code. Or rather some special condition (why it's there, I can't tell). See this bug for the follow-up.