[gtksourceview] javascript.lang: Allow \\ in bracketed groups.

[Sébastien Wilmet <swilmet src gnome org>]

commit 1df80221030f981b2f3fe810e98a0dde1a9b99bb
Author: Christoph Burschka <christoph burschka de>
Date:   Tue Dec 22 00:56:06 2015 +0100

    javascript.lang: Allow \\ in bracketed groups.
    
    Remove look-behind assertions and add the
    "escape" context inside "regex-bracketed".
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759744

 data/language-specs/javascript.lang | 7 +++++--
 tests/syntax-highlighting/file.js   | 6 ++++++
 2 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/data/language-specs/javascript.lang b/data/language-specs/javascript.lang
index 2d081495..0b39a9ae 100644
--- a/data/language-specs/javascript.lang
+++ b/data/language-specs/javascript.lang
@@ -58,8 +58,11 @@
     </context>
 
     <context id="regex-bracketed" style-ref="escape" style-inside="true">
-      <start>(?&lt;!\\)[[]</start>
-      <end>(?&lt;!\\)]</end>
+      <start>\[</start>
+      <end>]</end>
+      <include>
+        <context ref="escape"/>
+      </include>
     </context>
 
     <!--contexts used in the main context-->
diff --git a/tests/syntax-highlighting/file.js b/tests/syntax-highlighting/file.js
index 78cf4ef1..75800b9a 100644
--- a/tests/syntax-highlighting/file.js
+++ b/tests/syntax-highlighting/file.js
@@ -13,6 +13,12 @@ var matches = /abc/.exec('Alphabet ... that should contain abc, right?');
 a = [thing / thing, thing / thing];
 x = a /b/ c / d;
 
+// Character groups with backslashes:
+/[ab\\]/ // a, b or \
+/[ab\]]/ // a, b or ]
+/\\[ab]/ // a or b preceded by \
+/\[ab]/  // Literally "[ab]"
+
 // Template strings
 // ----------------
 // Template strings are delimited by back-ticks (grave accent) and