Fix: fix use of the add_editor_style wp function : needs relative paths

+ add rtl class to the inline font style in the wp editor
see presscustomizr/customizr#926

functions/init-admin.php

@@ -447,8 +447,12 @@ function hu_custom_meta_boxes() {
  //@return void()
  //hook : after_setup_theme
  function hu_add_editor_style() {
+ //we need only the relative path, otherwise get_editor_stylesheets() will treat this as external CSS
+ //which means:
+ //a) child-themes cannot override it
+ //b) no check on the file existence will be made (producing the rtl error, for instance : https://github.com/presscustomizr/customizr/issues/926)
  $_stylesheets = array(
- sprintf( '%1$sassets/admin/css/editor-style.css' , HU_BASE_URL ),
+ 'assets/admin/css/editor-style.css',
  //hu_get_front_style_url(),
  //get_stylesheet_uri()
  );
@@ -511,8 +515,11 @@ function hu_user_defined_tinymce_css( $init ) {
  $family = hu_get_fonts( array( 'font_id' => $user_font, 'request' => 'family' ) );//'"Raleway", Arial, sans-serif'
  $family = ( empty( $family ) || ! is_string( $family ) ) ? "'Titillium Web', Arial, sans-serif" : $family;
 
+ //maybe add rtl class
+ $_mce_body_context = is_rtl() ? 'mce-content-body.rtl' : 'mce-content-body';
+
  //fonts
- $_css = "body.mce-content-body{ font-family : {$family}; }\n";
+ $_css = "body.{$_mce_body_context}{ font-family : {$family}; }\n";
 
  $init['content_style'] = trim( preg_replace('/\s+/', ' ', $_css ) );