ListBox custom cell text overlaps the cell editor when editing

When a ListBox cell's text is custom-painted (a PaintCellText handler that returns True) and that cell is editable, double-clicking the cell to edit it shows two renderings of the text at once: the custom-painted text and the editing field's own text, at different sizes and positions. The editing field also uses the ListBox's font rather than the font the paint handler used, so in a short row the text can look doubled, misaligned, and clipped. Editing itself still works; the result is a visual glitch that looks like broken rendering. While a cell is being edited, the editing field should be the only text shown for that cell.