drscheme:unit:program-editor-mixin

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`drscheme:unit:program-editor-mixin`

This mixes in the ability to reset the highlighting for error message when the user modifies the buffer. Use it for editors that have program text where errors can occur. It clears the error highlighting when the buffer is modified.

(drscheme:unit:program-editor-mixin text) -> (extends text:basic%)
text : (extends text:basic%)

PLT