An addon's Lua and XML files were read with the exact case its `.toc` or `<Script file>` spelt. On a case-sensitive filesystem, Linux's, a file named in another case never loaded: Questie 3.7.1 lists `Astrolabe\Astrolabe.lua` from a folder shipped as `astrolabe`, so `Astrolabe` stayed nil and its OnUpdate raised every frame.
The reference is a Windows client, and every path it opens matches without regard to case. Addon textures and sounds already resolved that way through `loose_addon_file`; addon scripts, XML and `Bindings.xml` now go through the same resolver, and the second, case-sensitive one is gone. The shared resolver also refuses a component the host reads as more than a plain name (a Windows `C:`), so it still cannot leave the AddOns root.
Test: a file asked for in three spellings resolves to the one on disk; it fails without the change on a case-sensitive volume.
Fixes#851
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
