Add ctrl- compatibility bindings for modifier + nonprintable-key

    Historically, ctrl-i sends the same code as tab, ctrl-h sends backspace and
    ctrl-j and ctrl-m behave like enter.

    Even for terminals that send unambiguous encodings (using the kitty keyboard
    protocol), we have kept bindings like ctrl-h, to support existing habits.

    We forgot that pressing ctrl-alt-h would behave like alt-backspace,
    so maybe we should add that as well.

    Technically there are some more such as "ctrl-2" (which used to do the same
    as "ctrl-space") but I don't think anyone uses that. Same for ctrl-shift-i
    over shift-tab?

    Closes #https://github.com/fish-shell/fish-shell/discussions/11548

diff --git a/share/functions/__fish_shared_key_bindings.fish b/share/functions/__fish_shared_key_bindings.fish
index db4e936bf9..98e5cf982f 100644
--- a/share/functions/__fish_shared_key_bindings.fish
+++ b/share/functions/__fish_shared_key_bindings.fish
@@ -40,6 +40,7 @@
     bind --preset $argv ctrl-s pager-toggle-search
     # shift-tab does a tab complete followed by a search.
     bind --preset $argv shift-tab complete-and-search
+    bind --preset $argv ctrl-shift-i complete-and-search
     bind --preset $argv shift-delete history-delete or backward-delete-char
 
     bind --preset $argv down down-or-search
@@ -131,7 +132,9 @@
         bind --preset $argv "<" self-insert expand-abbr
         set -l maybe_search_field '(commandline --search-field >/dev/null && echo --search-field)'
         bind --preset $argv shift-enter "commandline -i \n $maybe_search_field" expand-abbr
-        bind --preset $argv alt-enter "commandline -i \n $maybe_search_field" expand-abbr
+        for alt_enter in alt-enter ctrl-alt-j ctrl-alt-m
+            bind --preset $argv $alt_enter "commandline -i \n $maybe_search_field" expand-abbr
+        end
         bind --preset $argv ")" self-insert expand-abbr # Closing a command substitution.
         bind --preset $argv ctrl-space 'test -n "$(commandline)" && commandline -i " " '$maybe_search_field
         # Shift-space behaves like space because it's easy to mistype.
diff --git a/share/functions/fish_default_key_bindings.fish b/share/functions/fish_default_key_bindings.fish
index f6d6ea3175..d4be4f3b63 100644
--- a/share/functions/fish_default_key_bindings.fish
+++ b/share/functions/fish_default_key_bindings.fish
@@ -52,11 +52,13 @@
     bind --preset $argv alt-c capitalize-word
     if test (__fish_uname) = Darwin
         bind --preset $argv alt-backspace backward-kill-word
+        bind --preset $argv ctrl-alt-h backward-kill-word
         bind --preset $argv ctrl-backspace backward-kill-token
         bind --preset $argv alt-delete kill-word
         bind --preset $argv ctrl-delete kill-token
     else
         bind --preset $argv alt-backspace backward-kill-token
+        bind --preset $argv ctrl-alt-h backward-kill-token
         bind --preset $argv ctrl-backspace backward-kill-word
         bind --preset $argv alt-delete kill-token
         bind --preset $argv ctrl-delete kill-word