This uses a menu and is thus subject to the menu icons visibility setting, but here it should reflect the view from the symbols list, and thus show the icon in all cases. You can view, comment on, or merge this pull request online at:
https://github.com/geany/geany/pull/1997
-- Commit Summary --
* Always show icons in the go to symbol popup
-- File Changes --
M src/symbols.c (2)
-- Patch Links --
https://github.com/geany/geany/pull/1997.patch https://github.com/geany/geany/pull/1997.diff