WHen printing from a patchview with and added or deleted
file, this can happen:

bad text index " linestart"
bad text index " linestart"
    while executing
"$w get "$index linestart" "$index lineend""
    (procedure "FindLastNumber" line 3)
    invoked from within
"FindLastNumber $::widgets($top,wLine2)"
    (procedure "PrintDiffs" line 18)
    invoked from within
"PrintDiffs .diff0"
    invoked from within
".pr.b1 invoke "
    invoked from within
".pr.b1 instate {pressed !disabled} { .pr.b1 state !pressed; .pr.b1 invoke } "
    (command bound to event)