[geary] Fix sketchy line breaking in quoted plain text.

[Michael Gratton <mjog src gnome org>]

commit 1d746e43c7da1106006549b5deedea4d85d76d28
Author: Michael James Gratton <mike vee net>
Date:   Thu Nov 16 18:04:18 2017 +1100

    Fix sketchy line breaking in quoted plain text.
    
    * src/engine/util/util-html.vala (smart_escape): Use "white-space:
      pre-wrap" for preserving whitespace to get decent work breaks.

 src/engine/util/util-html.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/engine/util/util-html.vala b/src/engine/util/util-html.vala
index 5eb45ab..522c119 100644
--- a/src/engine/util/util-html.vala
+++ b/src/engine/util/util-html.vala
@@ -182,7 +182,7 @@ public string smart_escape(string? text, bool preserve_whitespace_in_html) {
         preserve_whitespace_in_html = true;
     }
     if (preserve_whitespace_in_html)
-        res = @"<div style='white-space: pre;'>$res</div>";
+        res = @"<div style='white-space: pre-wrap;'>$res</div>";
     return res;
 }