That thing, there, what is it?

[Clark]

The document overview bar (bar between minimap and vscroll-bar) doesn't show up unless the vertical scroll bar is displayed. If your file is too small, it won't show up.

This line is pretty fat because my sample file is very small (see big fat vertical line). I just set a bookmark on line 2.

[dunkers]

Nope, don't have that.

[Dennis]

It also does not show up if there isn't anything for the document overview to show.  (Bookmarks, search result markers, references, pushed bookmarks, breakpoints, for examples).

[dunkers]

Ah! Yes, if I place a bookmark then it shows up for that file. But for references it doesn't, and if I force it by placing a bookmark the gutter shows but no reference.

[Dennis]

It only shows up for References if you have the option (in Tools > Options > Editing > Context Tagging > References) to "Highlight references in editor".  Turn this option on, then do a references search, and you should see the references in the overview bar.

[dunkers]

Ah-hah! Yes, it does. Thanks

Although I note that it is the highlight that's being shown rather than the reference flag per se. Useful for the different colours per reference, though (although pastel on grey doesn't stand out too well for some combinations). Now I know where to look, and what for, it is much more useful