Install show-font in an attempt to fix font errors

These occur on theme change when theme-buffet kicks in

unravel-emacs.org

@@ -735,7 +735,7 @@ Another section defines some complementary functionality
              :fixed-pitch-width nil
              :fixed-pitch-height 1.0
 
-             :fixed-pitch-serif-family nil
+             :fixed-pitch-serif-family "Iosevka"
              :fixed-pitch-serif-weight nil
              :fixed-pitch-serif-slant nil
              :fixed-pitch-serif-width nil
@@ -798,6 +798,52 @@ Another section defines some complementary functionality
              :line-spacing nil))))
 #+end_src
 
+** The =unravel-theme.el= section about ~show-font~
+:PROPERTIES:
+:CUSTOM_ID: h:60a005be-77bd-49f1-a865-78d7cf75bd2a
+:END:
+
+#+begin_quote
+This is yet another package of mine. It lets you preview a font inside
+of Emacs. It does so in three ways:
+
+- Prompt for a font on the system and display it in a buffer.
+- List all known fonts in a buffer, with a short preview for each.
+- Provide a major mode to preview a font whose file is among the
+  installed ones.
+#+end_quote
+
+Prot is the developer and maintainer of this package.
+
++ Package name (GNU ELPA): ~show-font~
++ Official manual: <https://protesilaos.com/emacs/show-font>
++ Change log: <https://protesilaos.com/emacs/show-font-changelog>
++ Git repository: <https://github.com/protesilaos/show-font>
+
+To actually set fonts, use the ~fontaine~ package ([[#h:cb41fef0-41a5-4a85-9552-496d96290258][The =unravel-theme.el= section about ~fontaine~]]).
+
+#+begin_src emacs-lisp :tangle "unravel-modules/unravel-theme.el"
+  ;;;; Show Font (preview fonts)
+  ;; Read the manual: <https://protesilaos.com/emacs/show-font>
+  (use-package show-font
+    :ensure t
+    :commands (show-font-select-preview show-font-list)
+    :config
+    ;; These are the defaults, but I keep them here for easier access.
+    (setq show-font-pangram 'prot)
+    (setq show-font-character-sample
+          "
+  ABCDEFGHIJKLMNOPQRSTUVWXYZ
+  abcdefghijklmnopqrstuvwxyz
+  0123456789   !@#$¢%^&*~|
+  `'\"‘’“”.,;:  ()[]{}—-_+=<>
+
+  ()[]{}<>«»‹› 6bB8&0ODdoa 1tiIlL|\/
+  !ij c¢ 5$Ss 7Z2z 9gqp nmMNNMW uvvwWuuw
+  x×X .,·°;:¡!¿?`'‘’   ÄAÃÀ TODO
+  "))
+#+end_src
+
 ** The =unravel-theme.el= section about ~variable-pitch-mode~ and font resizing
 :PROPERTIES:
 :CUSTOM_ID: h:60d6aae2-6e4b-402c-b6a8-411fc49a6857
@@ -810,7 +856,7 @@ The built-in ~variable-pitch-mode~ makes the current buffer use a
 proportionately spaced font. In technical terms, it remaps the
 ~default~ face to ~variable-pitch~, so whatever applies to the latter
 takes effect over the former. I take care of their respective font
-families in my ~fontaine~ setup ([[#h:cb41fef0-41a5-4a85-9552-496d96290258][The =prot-emacs-theme.el= section about ~fontaine~]]).
+families in my ~fontaine~ setup ([[#h:cb41fef0-41a5-4a85-9552-496d96290258][The =unravel-theme.el= section about ~fontaine~]]).
 
 I want to activate ~variable-pitch-mode~ in all buffers where I
 normally focus on prose. The exact mode hooks are specified in the
@@ -1038,7 +1084,7 @@ process.
     (server-start)))
 #+end_src
 
-** The =prot-emacs-essentials.el= section about ~expreg~ (tree-sitter mark syntactically)
+** The =unravel-essentials.el= section about ~expreg~ (tree-sitter mark syntactically)
 :PROPERTIES:
 :CUSTOM_ID: h:ceb193bf-0de3-4c43-8ab7-6daa50817754
 :END:
@@ -1190,7 +1236,7 @@ interpret user input and match candidates accordingly.
 
 - orderless :: This is the only completion style I use which is not
   built into Emacs and which I tweak further in a separate section
-  ([[#h:7cc77fd0-8f98-4fc0-80be-48a758fcb6e2][The =prot-emacs-completion.el= for the ~orderless~ completion style]]).
+  ([[#h:7cc77fd0-8f98-4fc0-80be-48a758fcb6e2][The =unravel-completion.el= for the ~orderless~ completion style]]).
   It matches patterns out-of-order. Patterns are typically words
   separated by spaces, though they can also be regular expressions,
   and even styles that are the same as the aforementioned ~flex~ and
@@ -1286,7 +1332,7 @@ soon as I type a space after some characters I am using ~orderless~.
 
 #+begin_quote
 The ~orderless~ package by Omar Antolín Camarena provides one of the
-completion styles that I use ([[#h:14b09958-279e-4069-81e3-5a16c9b69892][The =prot-emacs-completion.el= settings for completion styles]]).
+completion styles that I use ([[#h:14b09958-279e-4069-81e3-5a16c9b69892][The =unravel-completion.el= settings for completion styles]]).
 It is a powerful pattern matching algorithm that parses user input and
 interprets it out-of-order, so that =in pa= will cover ~insert-pair~
 as well as ~package-install~. Components of the search are
@@ -1547,7 +1593,7 @@ where the cursor is. The companion ~corfu-popupinfo-mode~ will show a
 secondary documentation popup if we move over a candidate but do not
 do anything with it.
 
-Also see [[#h:567bb00f-1d82-4746-93e5-e0f60721728a][the =prot-emacs-completion.el= settings for dynamic text expansion (~dabbrev~)]].
+Also see [[#h:567bb00f-1d82-4746-93e5-e0f60721728a][the =unravel-completion.el= settings for dynamic text expansion (~dabbrev~)]].
 #+end_quote
 
 #+begin_src emacs-lisp :tangle "unravel-modules/unravel-completion.el"

unravel-modules/unravel-theme.el

@@ -208,7 +208,7 @@
            :fixed-pitch-width nil
            :fixed-pitch-height 1.0
 
-           :fixed-pitch-serif-family nil
+           :fixed-pitch-serif-family "Iosevka"
            :fixed-pitch-serif-weight nil
            :fixed-pitch-serif-slant nil
            :fixed-pitch-serif-width nil
@@ -270,6 +270,26 @@
 
            :line-spacing nil))))
 
+;;;; Show Font (preview fonts)
+;; Read the manual: <https://protesilaos.com/emacs/show-font>
+(use-package show-font
+  :ensure t
+  :commands (show-font-select-preview show-font-list)
+  :config
+  ;; These are the defaults, but I keep them here for easier access.
+  (setq show-font-pangram 'prot)
+  (setq show-font-character-sample
+        "
+ABCDEFGHIJKLMNOPQRSTUVWXYZ
+abcdefghijklmnopqrstuvwxyz
+0123456789   !@#$¢%^&*~|
+`'\"‘’“”.,;:  ()[]{}—-_+=<>
+
+()[]{}<>«»‹› 6bB8&0ODdoa 1tiIlL|\/
+!ij c¢ 5$Ss 7Z2z 9gqp nmMNNMW uvvwWuuw
+x×X .,·°;:¡!¿?`'‘’   ÄAÃÀ TODO
+"))
+
 ;;;;; `variable-pitch-mode' setup
 (use-package face-remap
   :ensure nil