Fix some Paste scroll issues

Summary:
  - If a Paste has very long lines, we show far too much text in the summary, because we wrap the lines. Instead, overflow them.
  - If a Paste has very long unbroken lines (MMMMM...), they extend past the page. Instead, add a scrollable container.

Test Plan:
{F27868}

{F27869}

{F27870}

Reviewers: btrahan, codeblock, chad

Reviewed By: codeblock

CC: aran

Differential Revision: https://secure.phabricator.com/D4211

src/__celerity_resource_map__.php

@@ -2810,7 +2810,7 @@ celerity_register_resource_map(array(
   ),
   'phabricator-source-code-view-css' =>
   array(
-    'uri' => '/res/aa04c202/rsrc/css/layout/phabricator-source-code-view.css',
+    'uri' => '/res/87935c75/rsrc/css/layout/phabricator-source-code-view.css',
     'type' => 'css',
     'requires' =>
     array(

src/view/layout/PhabricatorSourceCodeView.php

@@ -67,11 +67,16 @@ final class PhabricatorSourceCodeView extends AphrontView {
     $classes[] = 'PhabricatorMonospaced';
 
     return phutil_render_tag(
+      'div',
+      array(
+        'class' => 'phabricator-source-code-container',
+      ),
+      phutil_render_tag(
         'table',
         array(
           'class' => implode(' ', $classes),
         ),
-      implode('', $rows));
+        implode('', $rows)));
   }
 
 }

webroot/rsrc/css/layout/phabricator-source-code-view.css

@@ -2,6 +2,11 @@
  * @provides phabricator-source-code-view-css
  */
 
+.phabricator-source-code-container {
+  overflow-x: auto;
+  overflow-y: hidden;
+}
+
 .phabricator-source-code {
   white-space: pre-wrap;
   padding: 2px 8px 1px;
@@ -28,3 +33,13 @@
 .phabricator-source-code-summary {
   margin-bottom: 4px;
 }
+
+/* If a Paste has enormously long lines, truncate them in the summary on the
+   list page. They'll be fully visible on the Paste itself. */
+.phabricator-source-code-summary .phabricator-source-code-container {
+  overflow-x: hidden;
+}
+
+.phabricator-source-code-summary .phabricator-source-code {
+  white-space: nowrap;
+}