Fix #4457: broken key sequences ending with C-i

core/core-keybinds.el

@@ -41,12 +41,16 @@ and Emacs states, and for non-evil users.")
 
 ;; HACK Fixes Emacs' disturbing inability to distinguish C-i from TAB.
 (define-key key-translation-map [?\C-i]
-  (cmd! (if (and (not (cl-position 'tab    (this-single-command-raw-keys)))
-                 (not (cl-position 'kp-tab (this-single-command-raw-keys)))
-                 (display-graphic-p))
+  (cmd! (if (let ((keys (this-single-command-raw-keys)))
+              (and keys
+                   (not (cl-position 'tab    keys))
+                   (not (cl-position 'kp-tab keys))
+                   (display-graphic-p)
+                   (let ((key
+                          (doom-lookup-key
+                           (vconcat (cl-subseq keys 0 -1) [C-i]))))
+                     (not (or (numberp key) (null key))))))
             [C-i] [?\C-i])))
-;; However, ensure <C-i> falls back to the old keybind if it has no binding.
-(global-set-key [C-i] [?\C-i])
 
 
 ;;

core/core-lib.el

@@ -94,6 +94,18 @@ at the values with which this function was called."
   (lambda (&rest pre-args)
     (apply fn (append pre-args args))))
 
+(defun doom-lookup-key (keys &optional keymap)
+  "Like `lookup-key', but search active keymaps if KEYMAP is omitted."
+  (if keymap
+      (lookup-key keymap keys)
+    (cl-loop for keymap
+             in (append (mapcar #'cdr (mapcar #'symbol-value emulation-mode-map-alists))
+                        (list (current-local-map))
+                        (mapcar #'cdr minor-mode-alist)
+                        (list (current-global-map)))
+             if (lookup-key keymap keys)
+             return it)))
+
 
 ;;
 ;;; Sugars