You should probably filter out glyphs for a specific spec, since you can't retrieve their state either when the spec isn't active. Or remembering the state of those glyphs if you happen to switch spec instead of recreating back the entire glyph list.

Originally posted by @Meivyn in #1 (comment)

I've added a filter in v1.3.0 - glyphs are now only shown if they match a learned spell or ability in the spellbook. This includes spells that are activated through talents (Dire Beast etc.). You can see the full list of glyphs for your active spec by clicking the "view all" checkbox. If you're on a low level character who hasn't chosen their spec yet, spec-specific glyphs are not included.