#20059: Formula::_get_sheet_index

Subroutine Formula::_get_sheet_index can't work with utf sheet names.
This patch seems fix it.

@@ -752, +752,14 @@ sub _get_sheet_index
my $self = shift;
my $sheet_name = shift;

+ if ($] >= 5.008) {
+ require Encode;
+ if (Encode::is_utf8($sheet_name)) {
+ $sheet_name = Encode::encode("UTF-16BE", $sheet_name);
+ }
+ }

if (not exists $self->{_ext_sheets}->{$sheet_name}) {
die "Unknown sheet name $sheet_name in formula\n";

Hi,

Thanks. I'll fox that in the next release.

John.
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