Error comparing accented words case insensitive

[rodrigoq]

Hello, compare this two texts on new documents with "Ignore Case" setting checked, the text should be evaluated as equal. You get differences on accented words.

Left:
LA MAÑANA PALABRA ACCIÓN
Right:
la mañana palabra acción

IF you remove accented chars (ñáéíóú, etc.) you get no differences lines

Configuration:
WinMerge.txt

[Tragen]

The same bug is in German.
ü and Ü are not the same.
öÖ
äÄ