Currently elog messages are asking people to install the dead and deprecated x11-themes/gnome-icon-theme manually instead of adwaita-icon-theme (its successor) The issue is that it seems chromium does something tricky when moving from one theme to the other :/ In some of my setups I can simply install adwaita-icon-theme and it works fine without the old gnome-icon-theme (you can check by uninstalling gnome-icon-theme and opening the "Downloads" page). But in others... I see missing icons even if I have exactly the same icon sets installed on my system with the same default gtkrc files (from gtk+2 and gtk+3...) I don't know where chromium (and google-chrome... as both behave in the same way) are getting the icon settings... do you know? I think the difference is something related with having and old configuration or not... as, if I don't misremember, the setups with the icons from adwaita working, were reset to fix another unrelated configuration issues... and now they are working nice :/ Thanks for your help (at least on trying to clarify how chromium is getting the icon theme)
OK, I have seen that, what was wrong on the setups with that not working, is that the value of "Icons" theme as seen from gnome-tweak-tool was "empty" instead of "Adwaita (default)". Once that is set to that default, all works fine without the old gnome-icon-theme In dconf-editor, I have tried to "reset" the values for /org/gnome/desktop/interface/icon-theme to the "default" value and it, indeed, sets again the right "Adwaita" value. Hence, this was probably a problem inherited from older gnome/gtk+ versions that weren't setting this value so explicitly
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=0091d8ee715343b48186119e3ee39dd54e239bee commit 0091d8ee715343b48186119e3ee39dd54e239bee Author: Mike Gilbert <floppym@gentoo.org> Date: Thu Apr 20 20:57:21 2017 -0400 www-client/chromium: update icon theme messaging Replace the static list of acceptable icon themes with some general advice instead. Bug: https://bugs.gentoo.org/605174 Package-Manager: Portage-2.3.5_p19, Repoman-2.3.2_p49 www-client/chromium/chromium-59.0.3067.0.ebuild | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)