Only unescape forward slashes in regular expressions if converting from slash bounds to %r bounds.

Author: kddnewton

CHANGELOG.md

@@ -40,6 +40,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 - Ensure the `Return` breaks with brackets and not parentheses.
 - Ensure trailing comments on parameter declarations are consistent.
 - Make `Command` and `CommandCall` aware that their arguments could exceed their normal expected bounds because of heredocs.
+- Only unescape forward slashes in regular expressions if converting from slash bounds to `%r` bounds.
 
 ### Removed
 

lib/syntax_tree.rb

@@ -9755,12 +9755,18 @@ def format(q)
         q.group do
           q.text("%r{")
 
-          parts.each do |part|
-            if part.is_a?(TStringContent)
-              q.text(part.value.gsub("\\/", "/"))
-            else
-              q.format(part)
+          if beginning == "/"
+            # If we're changing from a forward slash to a %r{, then we can
+            # replace any escaped forward slashes with regular forward slashes.
+            parts.each do |part|
+              if part.is_a?(TStringContent)
+                q.text(part.value.gsub("\\/", "/"))
+              else
+                q.format(part)
+              end
             end
+          else
+            q.format_each(parts)
           end
 
           q.text("}")