fix(vterm): +vterm/toggle creating duplicates

If vterm-buffer-name-string is set to non-nil, then vterm will rename
the buffer after it is initialized. Since +vterm/toggle looks up buffers
by name, it will lose track of them, causing it to create a new one on
each invocation. With this, it will no longer lose track of them.

Fix: #6651

modules/term/vterm/autoload.el

@@ -1,5 +1,7 @@
 ;;; term/vterm/autoload.el -*- lexical-binding: t; -*-
 
+(defvar +vterm--id nil)
+
 ;;;###autoload
 (defun +vterm/toggle (arg)
   "Toggles a terminal popup window at project root.
@@ -27,8 +29,13 @@ Returns the vterm buffer."
              (delete-window window))))
        (if-let (win (get-buffer-window buffer-name))
            (delete-window win)
-         (let ((buffer (get-buffer-create buffer-name)))
+         (let ((buffer (or (cl-loop for buf in (doom-buffers-in-mode 'vterm-mode)
+                                    if (equal (buffer-local-value '+vterm--id buf)
+                                              buffer-name)
+                                    return buf)
+                           (get-buffer-create buffer-name))))
            (with-current-buffer buffer
+             (setq-local +vterm--id buffer-name)
              (unless (eq major-mode 'vterm-mode)
                (vterm-mode)))
            (pop-to-buffer buffer)))