Re: Turning on/off tree-sitter modes

[Juri Linkov]

>>> I'd prefer
>>>
>>>     Major Mode Remap Alist:
>>>     List of remappings:
>>>     INS DEL
>>>              Remap from major mode: js-mode
>>>              To mode (or function): js-ts-mode
>> Here mode names are nicely aligned,
>> so it's easier to read for users.
>
> I think the forms for alist's values are extra indented intentionally. But
> it's not the best for aesthetics, I suppose.

I don't know why there is extra indentation in widget.
If offset is reduced from 12 to 9, this provides
better aesthetics with:

diff --git a/lisp/wid-edit.el b/lisp/wid-edit.el
index ba99847f488..bc12e26ac22 100644
--- a/lisp/wid-edit.el
+++ b/lisp/wid-edit.el
@@ -2862,7 +2865,7 @@ 'editable-list
   "A variable list of widgets of the same type."
   :convert-widget 'widget-types-convert-widget
   :copy 'widget-types-copy
-  :offset 12
+  :offset 9
   :format "%v%i\n"
   :format-handler 'widget-editable-list-format-handler
   :entry-format "%i %d %v"
diff --git a/lisp/files.el b/lisp/files.el
index a65bc4a4ea2..7ac22eac2fb 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3621,10 +3621,10 @@ major-mode-remap-alist
 FUNCTION is typically a major mode which \"does the same thing\" as
 MODE, but can also be nil to hide other entries (either in this var or
 in `major-mode-remap-defaults') and means that we should call MODE."
-  :type '(alist
-          :tag "Remappings"
-          :key-type (symbol :tag "From major mode")
-          :value-type (function :tag "To mode (or function)")))
+  :type '(alist :key-type   (symbol   :tag "Remap from major mode"))
+                :value-type (function :tag "To mode (or function)"))
+  :options '((js-mode   (function :value js-ts-mode))
+             (ruby-mode (function :value ruby-ts-mode)))
 
 (defvar major-mode-remap-defaults nil
   "Alist mapping file-specified modes to alternative modes.