Fix --theme(…)
function when legacy JS plugins are used
#17458
Merged
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Closes #17346
This PR fixes an issue that caused the
--theme(…)
function to behave differently after a legacy JS plugin or config was configured. The issue was that the compatibility layer would patch the theme value resolver to always inline the value. This, however, is only expected to happen if the path does not look like a CSS variable in which case this legacy code path should not be run.To fix this, I'm now keeping a reference to the regular theme resolution function and call into it if the path starts with
--
.Test plan
--theme(…)
resolution tests