HTML mail: assume body never ends

Fixes #4492

NEWS

@@ -18,6 +18,7 @@ Bug fixes
  - [web] fixed SAML2 session timeout handling during XHR requests
  - [web] fixed renaming a folder under iOS
  - [web] fixed download of exported folders under iOS
+ - [web] improved server-side CSS sanitizer
  - [eas] improved alarms syncing with EAS devices (#4351)
  - [eas] avoid potential cache update when breaking sync queries (#4422)
  - [eas] fixed EAS search

UI/MailPartViewers/UIxMailPartHTMLViewer.m

@@ -623,7 +623,9 @@ _xmlCharsetForCharset (NSString *charset)
         {
           if ([lowerName isEqualToString: @"body"])
             {
-              inBody = NO;
+              // Assume <body> never ends to properly display incorrectly constructed messages.
+              // See bug #4492
+              // inBody = NO;
               if (css)
                 [self _finishCSS];
             }