Please describe the problem:
Gnome terminal cannot handle combining characters correctly

Steps to reproduce:
Use bash in gnome terminal.

Type an 'o' (U+006F) at the bash prompt in Gnome terminal. Looks like this:

mfabian@magellan:~$ o
                     ^cursor position

Then, paste the character U+0308 (COMBINING DIAERESIS) behind that 'o'.
You can use 'ucm' to the the pasting, just select U+0308 in 'ucm' and
then paste it into the gnome-terminal.

Now it looks like this:

mfabian@magellan:~$ ö
                      ^cursor position

Note that the cursor position is one column too far to the right.

Type "Backspace". Now it looks like this:

mfabian@magellan:~$ o
                     ^cursor position

The dots above the 'o' have disappeared but the 'o' is still there.

Type "Backspace" again. No further change, you cannot delete the 'o'.


Actual results:
gnome-terminal gets confused where the cursor is.
Some characters are not displayed correctly.


Expected results:
Compare with xterm, mlterm, or recent versions of 
konsole to see the correct behavior.

Does this happen every time?
Yes.

Other information:
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