[geary/wip/765516-gtk-widget-conversation-viewer: 43/80] Fix "How does the code know the size to allocate" warning.

[Michael Gratton <mjog src gnome org>]

commit 727f517c049dee9782ab303a1e077e63838f6bf0
Author: Michael James Gratton <mike vee net>
Date:   Fri Apr 15 19:51:11 2016 +1000

    Fix "How does the code know the size to allocate" warning.

 .../conversation-viewer/conversation-web-view.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-web-view.vala 
b/src/client/conversation-viewer/conversation-web-view.vala
index a529422..480f573 100644
--- a/src/client/conversation-viewer/conversation-web-view.vala
+++ b/src/client/conversation-viewer/conversation-web-view.vala
@@ -64,6 +64,10 @@ public class ConversationWebView : StylishWebView {
     // only once loaded.
     public override void get_preferred_height(out int minimum_height,
                                               out int natural_height) {
+        // Silence the "How does the code know the size to allocate?"
+        // warning in GTK 3.20-ish.
+        base.get_preferred_height(out minimum_height, out natural_height);
+
         int preferred_height = 0;
         if (load_status == WebKit.LoadStatus.FINISHED) {
             preferred_height = (int) get_dom_document().get_body().offset_height;