The spec asserted that a paintable's intrinsic size reads 0x0 for an SVG
librsvg refuses. It does not: gtk_icon_theme_lookup_icon() never returns NULL
and always reports the requested size, and a valid icon, a malformed one and an
absent name all snapshot to the same texture node. GMarkup accepts the double
hyphen, and gdk-pixbuf goes through glycin here and refuses our own icons.
So the malformed file is caught by preprocess="xml-stripblanks", which runs
xmllint during glib-compile-resources and fails the build with file, line and
column. The runtime line keeps its format but asserts only what it can: the
name resolves, the resource is present, and the root element declares the size.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
