Why draw a grid behind text/code in the editor?

Two GNOME applications (Builder and Text Editor) have an option to draw a faint grid in the background of the text editing window. The grid does not map neatly onto the fixed-width font.

Does this serve any purpose beyond distinguishing IDE text from other text on the desktop?

(This image of GNOME Builder with a blue color scheme and grid enabled from a thread asking how to implement this in another IDE. Here it was referred to as a "graph paper background".)