German "Umlaute" (and probably other special characters) in path trigger erratic behavior

[AllesMeins]

Binary package hint: xfce4-terminal

Problem: When typing and editing comands that are longer than one line and the path contains "umlaute" characters go missing (they are no onger displayed, but are still present when command is executed), characters appear in the wrong place, copying this command does not work etc. This makes it impossible to write the command you want to

How to reprodude:

1.) Create an folder with special character in its name. For example "testütestä"
2.) Change into that folder
3.) Type a long command (long enough, that it doesn't fit into one line) or use the "up"-key to get one from your bash-history that is long enough
4.) Move cursor back to first line and try to edit the entered command somewhere in the middle
5.) Notice the strange behavior (characters apperear at the wrong place, pressing "del" deletes more than one character etc.)

In this directory copying the entered command will not work correctly either. Instead of copying the complete command as one line as usual it is split in two diffrent lines resulting in the execution of the first half, when you paste it back again.

My guess is, that the number of characters that will fit in the rest of the line is calculated wrong because of the special characters in the path.

ProblemType: Bug
Architecture: amd64
Date: Fri Feb 5 16:02:02 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: xfce4-terminal 0.4.2-1ubuntu1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-19.56-generic
SourcePackage: xfce4-terminal
Uname: Linux 2.6.31-19-generic x86_64