[plt-scheme] [Mred] - syntax coloring in editor canvas

>>i saw methods which changes colors but wasn't able to make them  work at 
>>all, because the way i meant it is: using regexp-match to  look for the 
>>keyword each time the user type text into the edit  canvas (when i get an 
>>on-char event i call for the coloring  function, on the line or the entire 
>>editor canvas content)
>
>You probably want after-insert and after-delete, rather than on-char.

would you mind explaining me the proper way to use after-insert and 
after-delete to detect user changes into the editor-canvas : do i need to 
redefine a personalized editor text which class is editor-canvas%, then 
define/augment the after-insert & after-delete methods?

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