Re: Adding missing C-x 5 C-j and C-x t C-j commands

[Juri Linkov]

>> If we miss some of them out because we've since added C-x 5 5,
>> we are asking the user to keep track of which things under C-x 4 have
>> bindings under C-x 5 and which don't -- one has to remember that C-x 4
>> C-j exists but C-x 5 C-j doesn't.
>
> I meant: one has to remember that C-x 5 p and C-x 5 d exist but
> C-x 5 C-j doesn't.

For new commands that don't have a C-x 4 binding
it makes sense to use C-x 5 5, but if a binding
already exists in the C-x 4 keymap, it could be synced
with the C-x 5 keymap for consistency.  And indeed
dired-jump-other-frame is missing among existing keys:

C-x 4 C-f find-file-other-window             C-x 5 C-f find-file-other-frame
C-x 4 C-j dired-jump-other-window            !!!
C-x 4 C-o display-buffer                     C-x 5 C-o 
display-buffer-other-frame
C-x 4 .   xref-find-definitions-other-window C-x 5 .   
xref-find-definitions-other-frame
C-x 4 0   kill-buffer-and-window             C-x 5 0   delete-frame
C-x 4 4   other-window-prefix                C-x 5 5   other-frame-prefix
C-x 4 a   add-change-log-entry-other-window
C-x 4 b   switch-to-buffer-other-window      C-x 5 b   
switch-to-buffer-other-frame
C-x 4 c   clone-indirect-buffer-other-window C-x 5 c   clone-frame
C-x 4 d   dired-other-window                 C-x 5 d   dired-other-frame
C-x 4 f   find-file-other-window             C-x 5 f   find-file-other-frame
C-x 4 m   compose-mail-other-window          C-x 5 m   compose-mail-other-frame
C-x 4 p   project-other-window-command       C-x 5 p   
project-other-frame-command
C-x 4 r   find-file-read-only-other-window   C-x 5 r   
find-file-read-only-other-frame