app_containers: Add support for icon generation in pixmaps

app_containers/.local/bin/generate_shortcut_container_app

@@ -31,6 +31,7 @@ else
   icon_root=$container_root/usr/share/icons/hicolor
 fi
 
+icon_pixmap=false
 if [ "${icon_name:0:1}" = "/" ]; then
   icons=("$container_root$icon_name")
   icon_name=$(basename "$icon_name")
@@ -40,12 +41,21 @@ if [ "${icon_name:0:1}" = "/" ]; then
 else
   icons=($(sudo find $icon_root -name "$icon_name.*"))
   icon_absolute_path=false
+
+  if [ ${#icons[@]} == 0 ]; then
+    # Pixmap icons (but really, apps should stop putting icons in pixmaps)
+    icon_root=$container_root/usr/share/pixmaps
+    icons=($(sudo find $icon_root -name "$icon_name.*"))
+    icon_pixmap=true
+  fi
 fi
 [ ${#icons[@]} == 0 ] && die "Cannot find any icon for app $app_name"
 
 for icon in ${icons[@]}; do
   if $icon_absolute_path; then
     icon_target=$HOME/.local/share/icons/hicolor/256x256/apps/$icon_name.$icon_ext # See comment before; this is to avoid name conflicts
+  elif $icon_pixmap; then
+    icon_target=${icon//$icon_root/$HOME/.local/share/icons/hicolor/256x256/apps} # Use 256x256 by default when unspecified
   else
     icon_target=${icon//$icon_root/$HOME/.local/share/icons/hicolor}
   fi