Version:           3.0.4 (using 4.0.4 (KDE 4.0.4 >= 20080505) "release 15.2", openSUSE 11.0 (i586))
Compiler:          gcc
OS:                Linux (i686) release 2.6.25.18-0.2-default

duplicate of https://bugs.kde.org/show_bug.cgi?id=109183 , though now for KDE 4.

e.g. select the 3x2 block "a b" + "c d" below, and replace " " with ""
        a b
        c d

try to replace " " with "_" in the above example results in
        a_b
________c_d

Also, if you let the cursor go past the end of the block, nothing gets selected. Fortunately the line wrapping seems to be independent of this bug, i.e. if this is fixed, it should work with wrapped blocks as well.

[to whomever] if you can't verify yourself and need a video, I might be able to do it sometime, but it should be pretty reproducible.

thanks,
Nicholas