This is a minor bash specific bug in tab completion.
If you make a bookmark with the same name as the directory, for example:
mara@andromeda:~/bin/android-sdk-linux/extras$ to -b extras
and then navigate one directory up
mara@andromeda:~/bin/android-sdk-linux/extras$ cd ..
and then begin tab completion off of that bookmark it adds an extra slash
mara@andromeda:~/bin/android-sdk-linux$ to extras/
android// google//
This is a minor bug, as the completion itself works fine. It is just the displayed suggestions that have extra slashes. This error continues into all suggestions in subdirectories:
mara@andromeda:~/bin/android-sdk-linux$ to extras/android/support/
samples// v13// v4// v7//