Some information in our UI is secondary or complementary, and as such it doesn’t need to be as prominent as other elements. GtkBuilder’s .ui files allow designers to create a visual hierarchy by means of the “scale” Pango attribute and style classes like “dim-label”. Together, they help to create visually clearer UIs.

For instance, in a welded UI file like specialcharacters.ui (cui module), I can add the following markup to the “charname” GtkLabel…:

     <style>
       <class name="dim-label"/>
     </style>
     <attributes>
       <attribute name="scale" value="0.8"/>
     </attributes>

… to make it smaller (by 1 pt) and dimmed. This works well under Linux, but doesn’t have any effect under Windows, and I presume under macOS as well (didn’t test). I would like that, under Windows, LibreOffice at least interpret the scale part to make some secondary-info labels smaller. I don’t ask for the dimmed style to be reimplemented into LO because I know such styles belong to Gtk+ themes <rant>(which apparently Gtk+ developers intend to drop because GNOME loves to sabotage itself as a viable, flexible platform)</rant>.