Emacs: Add comments on Eshell, EXWM, mu4e

.emacs.d/lisp/init-eshell.el

@@ -6,6 +6,8 @@
 ;;; modules, runs their hooks and concludes with `eshell-first-time-mode-hook'
 ;;; (for the first session only) and `eshell-mode-hook'.
 
+;;; TODO: Cannot "C-c C-c" during a `sudo pacman -Syu`.
+
 ;;; REVIEW: Eshell/Shell completion fails when PATH has a non-readable element.
 ;; See https://github.com/emacs-helm/helm/issues/1785
 ;; and https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27300.

.emacs.d/lisp/init-exwm.el

@@ -10,6 +10,8 @@
 ;; as is the case when using another WM.
 ;; TODO: Would it be possible to have permanenet right-aligned display?
 ;; https://github.com/zk-phi/symon/issues/32
+;; TODO: Sometimes dots are not printed:
+;; https://github.com/zk-phi/symon/issues/33
 (when (require 'symon nil t)
   (symon-mode))
 

.emacs.d/lisp/init-mu4e.el

@@ -4,6 +4,7 @@
 ;; TODO: Reply to all by default.
 ;; TODO: Is it possible to mbsync without attachments?
 ;; TODO: Use abbrevs in compose mode.
+;; TODO: Toggle between HTML and plain text.
 
 (when (require 'mu4e-maildirs-extension nil t)
   (mu4e-maildirs-extension))