[wp-trac] [WordPress Trac] #34208: is_rtl() does not work in Plugin with own Themes

[WordPress Trac]

#34208: is_rtl() does not work in Plugin with own Themes
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 Reporter:  AppFIX-DE          |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Plugins            |     Version:  4.3.1
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  rtl
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Comment (by AppFIX-DE):

 @ocean90
 @mark-k

 In this Plugin you can use two themes at the same time. If you put
 domain.de it show Theme A and if you put domain.de/?system=app it show
 Theme B. And if i install the Plugin the function work but he can't find
 the function is_rtl() and i get a white screen in the backend.

 If i change the wp-includes/theme.php  "if ( is_rtl() )" to "if (
 function_exists( 'is_rtl' ) && is_rtl() )" it's work.

 I think it's a Bug from Wordpress side.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34208#comment:5>
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