[geary/wip/778025-conversation-height-0.12: 3/3] Use doc element's scrollHeight as ClientWebView's preferred height

[Michael Gratton <mjog src gnome org>]

commit b23a67f2f3d44b7296b931cb95df8b830ac9e128
Author: Michael Gratton <mike vee net>
Date:   Sun Oct 14 11:55:46 2018 +1100

    Use doc element's scrollHeight as ClientWebView's preferred height
    
    This seems to be a bit more accurate than the previous calculation.
    Force the doc element's border to zero as well to make using
    scrollHeight more reliable.

 ui/client-web-view.js        | 12 +-----------
 ui/conversation-web-view.css |  1 +
 2 files changed, 2 insertions(+), 11 deletions(-)
---
diff --git a/ui/client-web-view.js b/ui/client-web-view.js
index e3b85b0e..a4542133 100644
--- a/ui/client-web-view.js
+++ b/ui/client-web-view.js
@@ -71,17 +71,7 @@ PageState.prototype = {
         }, false); // load does not bubble
     },
     getPreferredHeight: function() {
-        let html = window.document.documentElement;
-        let height = html.offsetHeight;
-        let computed = window.getComputedStyle(html);
-        let top = computed.getPropertyValue('margin-top');
-        let bot = computed.getPropertyValue('margin-bottom');
-
-        return (
-            height
-                + parseInt(top.substring(0, top.length - 2))
-                + parseInt(bot.substring(0, bot.length - 2))
-        );
+        return window.document.documentElement.scrollHeight;
     },
     loaded: function() {
         this.isLoaded = true;
diff --git a/ui/conversation-web-view.css b/ui/conversation-web-view.css
index 0040bca3..d2ca87a1 100644
--- a/ui/conversation-web-view.css
+++ b/ui/conversation-web-view.css
@@ -24,6 +24,7 @@ html {
      expanding web view */
   box-sizing: border-box !important;
   margin: 0 !important;
+  border-width: 0 !important;
 }
 
 body {