SL-16698 Replace tabs with spaces which are used in the editor

indra/newview/llpreviewnotecard.cpp

@@ -866,7 +866,10 @@ bool LLPreviewNotecard::loadNotecardText(const std::string& filename)
     buffer[nread] = '\0';
     fclose(file);
 
-    mEditor->setText(LLStringExplicit(buffer));
+    std::string text = std::string(buffer);
+    LLStringUtil::replaceTabsWithSpaces(text, LLTextEditor::spacesPerTab());
+
+    mEditor->setText(text);
     delete[] buffer;
 
     return true;