From e33305afaef53e296cbcf468dafec460f3661793 Mon Sep 17 00:00:00 2001
From: Jose Antonio Ortega Ruiz <jao@gnu.org>
Date: Sun, 12 Jun 2016 18:32:48 +0200
Subject: Real fix fontification on scheme switch

---
 elisp/geiser-base.el   | 10 +++++++++-
 elisp/geiser-mode.el   |  4 +++-
 elisp/geiser-syntax.el | 13 ++++++++-----
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/elisp/geiser-base.el b/elisp/geiser-base.el
index 4d303db..ee30770 100644
--- a/elisp/geiser-base.el
+++ b/elisp/geiser-base.el
@@ -1,6 +1,6 @@
 ;;; geiser-base.el --- shared bits
 
-;; Copyright (C) 2009, 2010, 2012, 2013, 2015  Jose Antonio Ortega Ruiz
+;; Copyright (C) 2009, 2010, 2012, 2013, 2015, 2016  Jose Antonio Ortega Ruiz
 
 ;; This program is free software; you can redistribute it and/or
 ;; modify it under the terms of the Modified BSD License. You should
@@ -27,6 +27,14 @@
     (let ((inhibit-changing-match-data t))
       (looking-at regexp))))
 
+(when (not (fboundp 'font-lock-ensure))
+  (defun font-lock-ensure (&optional beg end)
+    (with-no-warnings (font-lock-fontify-region (or beg (point-min))
+                                                (or end (point-max))))))
+
+(when (not (fboundp 'font-lock-flush))
+  (defun font-lock-flush (&optional beg end)))
+
 ;;; Utilities:
 
 (defsubst geiser--chomp (str)
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index 5747f40..4ca8af2 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -198,7 +198,9 @@ With prefix, recursively macro-expand the resulting expression."
   (geiser-syntax--remove-kws)
   (let ((impl (geiser-impl--read-impl)))
     (geiser-impl--set-buffer-implementation impl)
-    (geiser-repl--set-up-repl impl)))
+    (geiser-repl--set-up-repl impl)
+    (geiser-syntax--add-kws)
+    (geiser-syntax--fontify)))
 
 (defun geiser-mode-switch-to-repl (arg)
   "Switches to Geiser REPL.
diff --git a/elisp/geiser-syntax.el b/elisp/geiser-syntax.el
index 0abd03c..fb579e7 100644
--- a/elisp/geiser-syntax.el
+++ b/elisp/geiser-syntax.el
@@ -487,16 +487,19 @@ implementation-specific entries for font-lock-keywords.")
           (scheme-mode)))
         buffer))
 
+(defun geiser-syntax--fontify (&optional beg end)
+  (let ((font-lock-verbose nil)
+        (beg (or beg (point-min)))
+        (end (or end (point-max))))
+    (font-lock-flush beg end)
+    (font-lock-ensure beg end)))
+
 (defun geiser-syntax--scheme-str (str)
   (save-current-buffer
     (set-buffer (geiser-syntax--font-lock-buffer))
     (erase-buffer)
     (insert str)
-    (let ((font-lock-verbose nil))
-      (if (fboundp 'font-lock-ensure)
-          (font-lock-ensure)
-        (with-no-warnings
-          (font-lock-fontify-buffer))))
+    (geiser-syntax--fontify)
     (buffer-string)))
 
 
-- 
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