[evolution] I#824 - EWebView: Should not force EWebView colors on IFrame body

[Milan Crha <mcrha src gnome org>]

commit 456cf10ec53f77c7626b4df1f3124eb598942343
Author: Milan Crha <mcrha redhat com>
Date:   Fri Mar 13 10:09:53 2020 +0100

    I#824 - EWebView: Should not force EWebView colors on IFrame body
    
    Closes https://gitlab.gnome.org/GNOME/evolution/issues/824

 data/webkit/e-web-view.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/webkit/e-web-view.js b/data/webkit/e-web-view.js
index e84fd7eb95..8b54bf429f 100644
--- a/data/webkit/e-web-view.js
+++ b/data/webkit/e-web-view.js
@@ -588,7 +588,7 @@ Evo.initialize = function(elem)
                        Evo.initializeAndPostContentLoaded(elems[ii]);
        }
 
-       if (!doc.body.hasAttribute("class"))
+       if (doc.defaultView && !doc.defaultView.frameElement && !doc.body.hasAttribute("class"))
                doc.body.className = "-e-web-view-background-color -e-web-view-text-color";
 
        if (doc.documentElement.style.getPropertyValue("color") == "" ||