[elpa] externals/preview-auto a9cebc08b4: Disable preview for regions consisting of just backslashes

[ELPA Syncer]

branch: externals/preview-auto
commit a9cebc08b4f67488acd27967fd772a0fb93eab1d
Author: Paul Nelson <ultrono@gmail.com>
Commit: Paul Nelson <ultrono@gmail.com>

    Disable preview for regions consisting of just backslashes
    
    * preview-auto.el (preview-auto--update-editing-region): Make it so
    that backslashes alone do not contribute towards the active editing
    region being considered "nonempty".
---
 preview-auto.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/preview-auto.el b/preview-auto.el
index 333a769967..7614b4f3ff 100644
--- a/preview-auto.el
+++ b/preview-auto.el
@@ -388,8 +388,10 @@ ORIG-FUN is the original function, and ARGS are its 
arguments."
                  (end (save-excursion
                         (preview-auto--search (regexp-quote end-string)
                                               limit))))
-              ;; Don't preview empty regions.
-              (when (string-match-p "[^[:space:]\n\r]"
+              ;; Don't preview essentially empty regions.  Exclude
+              ;; backslashes to avoid issues with previewing
+              ;; regions-in-progress such as "$\$".
+              (when (string-match-p "[^[:space:]\n\r\\]"
                                     (buffer-substring-no-properties
                                      (+ begin (length why))
                                      (- end (length end-string))))