Core: Add compatibility shims for Spell and SpellBook functions #88
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Lua does not support mixing of function calls that return multiple values and logical expressions. The original call would have only ever yielded the "name" value, as all other return values would have been truncated.
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The IsUsableSpell method has been renamed to C_Spell.IsSpellUsable, the call and return signatures have not changed however, so a simple alias is sufficient.
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Many Spell- and SpellBook-related functions were deprecated in Dragonflight and removed in The War Within (as expected).
Those functions have been moved out of the global namespace and into the
C_SpellandC_SpellBooknamespaces respectively and have also been split up into specific functions interacting with spells or the spell book.Shims for the old functions thus need to use different function calls depending on the call signature (probably a reason why this was split up).
This will fix a whole lot of issues related with spell flyout menus, as
LibActionButtonis severely outdated and still uses the long-deprecated old global functions.Note
This is a band-aid over the fact that
LibActionButtonhas not been updated in years and should ideally replaced entirely.This PR is based on #86 and should be merged before this PR. A rebase-merge should eliminate the superfluous two commits automatically then.