icon-loader: Small tweaks for performance/scope
Move the window
only to where/if it's needed.
Don't construct a temporary Glib::ustring just to append, when Glib::ustring.operator+= can take a char const * just fine as-is.
Move the window
only to where/if it's needed.
Don't construct a temporary Glib::ustring just to append, when Glib::ustring.operator+= can take a char const * just fine as-is.