Requirement: adding "selecting column by column"
To work reasonably with source code it is more and more necessary to select columns as well. Other IDE use the "Alt" key to change from line selection to column selection. Example, Change all "public" to "protected":
[GtkChild] public TextView buildTextView;
[GtkChild] public TreeView searchList;
[GtkChild] public TreeView breakPoints;
[GtkChild] public TreeView callStack;
[GtkChild] public TreeView localSymbols;
[GtkChild] public TextView appOutput;