Encoding Problem: QT Apps delete all non ASCII chars from files

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http://unix.stackexchange.com – QT applications are deleting non-latin characters from ISO-8859 encoded files on my Gentoo system. Actually I'm trying to merge two German files with KDiff3 and P4Merge (making "Whlen" out of "Wählen"). Both tools don't display the Umlauts and when the file is saved, they also disappear in the file. The Dejavu Monospace font is used, Courier New shows the same behavior. If UTF-8 encoded files are presented to the tools, all non-latins are handled correctly. GTK Meld (and all other GTK apps) handles the chars (ISO-88591 and UTF-8) quite well. I believe its my Locale configuration, but can't (HowTos)