[geary/wip/message-body-hight: 2/2] ClientWebView: Use HTML element's height to determine preferred

[Michael Gratton <mjog src gnome org>]

commit c27d25003278a788b9e04661404c090f33cfa247
Author: Michael Gratton <mike vee net>
Date:   Mon May 6 21:43:06 2019 +1000

    ClientWebView: Use HTML element's height to determine preferred
    
    Return the scroll height of the HTML element since the BODY
    may have margin/border/padding and we want to know
    precisely how high the widget needs to be to avoid
    scrolling.

 ui/client-web-view.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/ui/client-web-view.js b/ui/client-web-view.js
index 8f71594f..75bdecf1 100644
--- a/ui/client-web-view.js
+++ b/ui/client-web-view.js
@@ -90,7 +90,11 @@ PageState.prototype = {
         }, false); // load does not bubble
     },
     getPreferredHeight: function() {
-        return window.document.body.scrollHeight;
+        // Return the scroll height of the HTML element since the BODY
+        // may have margin/border/padding and we want to know
+        // precisely how high the widget needs to be to avoid
+        // scrolling.
+        return window.document.documentElement.scrollHeight;
     },
     getHtml: function() {
         return document.body.innerHTML;