[1.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions#4405
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[1.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions#4405
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Boolean return values from `addCustomLessFunction` were wrapped in
`Less_Tree_Quoted`, producing a quoted string ('true'/'false') instead
of a Less keyword (true/false). Quoted strings do not match in mixin
guards, making it impossible to use boolean-returning functions with
`.mixin(false) {}` patterns.
Switch to `Less_Tree_Keyword` so booleans behave as proper Less keywords.
CSS custom property output is unchanged; only mixin guard matching is fixed.
Fixes #4383
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes #4383.
Problem
addCustomLessFunctionwrapped boolean return values inLess_Tree_Quoted('', 'true'/'false'), producing a quoted string in Less. Less's built-in boolean keywords (true/false) areLess_Tree_Keyword, not quoted strings. This meant boolean-returning custom functions could not be used in mixin guards:Fix
Use
Less_Tree_Keywordinstead ofLess_Tree_Quotedfor boolean return values. CSS custom property output is unchanged (falserenders asfalsein both cases); only mixin guard matching is fixed.Test
Extended the existing
theme_extender_can_add_custom_functiontest with a mixin guard that must matchfalse— asserting that.dummy_func_test3{color:red}appears in the compiled CSS.