Fix language selection for spellchecker in html mode (#6915)

Also fix so the language is not reset when switching from html to plain
text and vice-versa.

CHANGELOG

@@ -56,6 +56,7 @@ CHANGELOG Roundcube Webmail
 - Enigma: Fix error message when trying to encrypt with a revoked key (#6607)
 - Enigma: Fix "decryption oracle" bug [CVE-2019-10740] (#6638)
 - Enigma: Fix bug where signature verification could have been skipped for some message structures (#6838)
+- Fix language selection for spellchecker in html mode (#6915)
 - Fix css styles leak from replied/forwarded message to the rest of the composed text (#6831)
 - Fix invalid path to "add contact" icon when using assets_path setting
 - Fix invalid path to blocked.gif when using assets_path setting (#6752)

program/js/editor.js

@@ -69,12 +69,15 @@ function rcube_text_editor(config, id)
     }
   }
 
-  // secure spellchecker requests with Roundcube token
   // Note: must be registered only once (#1490311)
   if (!tinymce.registered_request_token) {
     tinymce.registered_request_token = true;
     tinymce.util.XHR.on('beforeSend', function(e) {
+      // secure spellchecker requests with Roundcube token
       e.xhr.setRequestHeader('X-Roundcube-Request', rcmail.env.request_token);
+      // A hacky way of setting spellchecker language (there's no API for this in Tiny)
+      if (e.settings && e.settings.data)
+        e.settings.data = e.settings.data.replace(/^(method=[a-zA-Z]+&lang=)([^&]+)/, '$1' + rcmail.env.spell_lang);
     });
   }
 
@@ -405,12 +408,7 @@ function rcube_text_editor(config, id)
   // get selected (spellchecker) language
   this.get_language = function()
   {
-    if (this.editor) {
+    return rcmail.env.spell_lang;
-      return this.editor.settings.spellchecker_language || rcmail.env.spell_lang;
-    }
-    else if (this.spellchecker) {
-      return GOOGIE_CUR_LANG;
-    }
   };
 
   // set language for spellchecking
@@ -419,11 +417,14 @@ function rcube_text_editor(config, id)
     var ed = this.editor;
 
     if (ed) {
+      // TODO: this has no effect in recent Tiny versions
       ed.settings.spellchecker_language = lang;
     }
     if (ed = this.spellchecker) {
       ed.setCurrentLanguage(lang);
     }
+
+    rcmail.env.spell_lang = lang;
   };
 
   // replace selection with text snippet