Version: (using Devel)
Installed from: Compiled sources
In Dolphin 4.1.86 (using unofficial Debian packages from kde42.debian.net at version 4:4.1.86+svn902162-0r1), pressing Ctrl+A while in-line editing a filename selects all files as opposed to selecting all characters in the filename.
This just _might_ be related to the QT issues pointed to in http://bugs.kde.org/show_bug.cgi?id=179806.
Qt: 4.4.3 + qt-copy-patches-889120
KDE: 4.2.60 (KDE 4.2.60 (KDE 4.3 >= 20090106))
kdelibs svn rev. 907011 / kdebase svn rev. 907011
on ArchLinux x86_64 - Kernel 188.8.131.52
I can reproduce this.
This works for me in current trunk (but 4.2.0 is indeed buggy). Probably fixed by David's fix for bug 181180.
This should work fine in KDE 4.2.1 when it's out, please reopen the bug if I'm wrong. Thanks!