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fix: truncate strings on UTF-8 boundaries in StrEllipsis #2514

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Merged
ansgarbecker merged 1 commit into from
Jun 11, 2026
+9 −8
Merged

fix: truncate strings on UTF-8 boundaries in StrEllipsis #2514

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17 changes: 9 additions & 8 deletions source/apphelpers.pas
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Original file line number Diff line number Diff line change
Expand Up @@ -530,16 +530,17 @@ function Explode(Separator, Text: String): TStringList;
}
function StrEllipsis(const S: String; MaxLen: Integer; FromLeft: Boolean=True): String;
begin
// Truncate on UTF-8 codepoint boundaries, not raw bytes. A byte-wise cut (SetLength/Copy)
// can split a multi-byte character and produce invalid UTF-8. On the Cocoa widgetset such a
// string converts to a nil NSString, which crashes -[NSMenuItem initWithTitle:] when the
// result is used as a menu caption (e.g. quick filter items).
Result := S;
if Length(Result) <= MaxLen then
if UTF8Length(Result) <= MaxLen then
Exit;
if FromLeft then begin
SetLength(Result, MaxLen);
Result := Result + '…';
end else begin
Result := Copy(Result, Length(Result)-MaxLen, Length(Result));
Result := '…' + Result;
end;
if FromLeft then
Result := UTF8Copy(Result, 1, MaxLen) + '…'
else
Result := '…' + UTF8Copy(Result, UTF8Length(Result) - MaxLen + 1, MaxLen);
end;


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