In fact, I am implementing something like:
[scriptable, uuid(3c2a2d26-08d6-415b-a635-24f15983bde6)]
interface nsIMultilineTreeView: nsITreeView
{
long getCellTextPartCount(in long row, in nsITreeColumn col);
AString getCellTextPart(in long row, in nsITreeColumn col, in long partIdx);
void getCellTextPartProperties(in long row, in nsITreeColumn col, in long
partIdx, in nsIMutableArray properties);
long getDescriptionTextPartCount(in long row);
AString getDescriptionTextPart(in long row, in long partIdx);
void getDescriptionTextPartProperties(in long row, in long partIdx, in
nsIMutableArray properties);
boolean isMultiline();
};
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