Created attachment 237878 [details]
Patch that fixes the issue by copying the icon_info before modification

gtk_icon_theme_lookup_by_gicon has an issue where it modifies cached data. This can for example be seen in the evolution folder list when new mail arrives in a subfolder. It works as follows:

 1. Normal (non-stared) folder is drawn, and the icon info for it is cached by gtk_icon_theme_choose_icon
 2. Emblemed version is drawn
 3. gtk_icon_theme_lookup_by_gicon looks up the non-emblemed icon using gtk_icon_theme_lookup_by_gicon
 4. gtk_icon_theme_lookup_by_gicon returns cached icon info from gtk_icon_theme_choose_icon
 5. gtk_icon_theme_lookup_by_gicon modifies the returned icon info and adds the emblem information

From this point onwards the GtkIconInfo for the non-emblemed version contains the emblem list.

Attach patch fixes it for me.