Comment 1 for bug 1192023

See also:
<http://thread.gmane.org/gmane.comp.graphics.inkscape.devel/40635/focus=40658>

Raising bug importance to 'High' since this regression (not present in Tav's original implementation) can cause data loss (think of editing a large map, with many instances of map symbols, and the need to edit a detail in one of the symbol definitions (e.g. a fill color) - oops: all inserted instances of the same symbol are gone -> the user has to reinsert them again (if he recalls their exact positions at all), or to undo and to adjust to the old unedited symbols on the map).