Switch back to zwsp for oncopy line marker

Summary:
Fixes T4759.

Turns out Chrome on windows doesn't really like the word joiner character. We'll switch back to zwsp but make it `position: absolute;` so it doesn't turn into a line break.

Test Plan: Looked at diffs in IE9 and Chrome Windows. Made sure copying still works as expected.

Reviewers: chad, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4759

Differential Revision: https://secure.phabricator.com/D8727

resources/celerity/map.php

@@ -8,9 +8,9 @@ return array(
   'names' =>
   array(
     'core.pkg.css' => 'ab5dd633',
-    'core.pkg.js' => '68839013',
+    'core.pkg.js' => 'c5b39816',
     'darkconsole.pkg.js' => 'ca8671ce',
-    'differential.pkg.css' => '9578e86b',
+    'differential.pkg.css' => '12c11318',
     'differential.pkg.js' => '11a5b750',
     'diffusion.pkg.css' => '3783278d',
     'diffusion.pkg.js' => '5b4010f4',
@@ -55,7 +55,7 @@ return array(
     'rsrc/css/application/countdown/timer.css' => '86b7b0a0',
     'rsrc/css/application/diff/inline-comment-summary.css' => '14a91639',
     'rsrc/css/application/differential/add-comment.css' => 'c478bcaa',
-    'rsrc/css/application/differential/changeset-view.css' => '6a0299e9',
+    'rsrc/css/application/differential/changeset-view.css' => '1570a1ff',
     'rsrc/css/application/differential/core.css' => '7ac3cabc',
     'rsrc/css/application/differential/results-table.css' => '239924f9',
     'rsrc/css/application/differential/revision-comment.css' => '48186045',
@@ -463,7 +463,7 @@ return array(
     'rsrc/js/core/behavior-line-linker.js' => 'bc778103',
     'rsrc/js/core/behavior-more.js' => '9b9197be',
     'rsrc/js/core/behavior-object-selector.js' => 'b4eef37b',
-    'rsrc/js/core/behavior-oncopy.js' => 'e69e4400',
+    'rsrc/js/core/behavior-oncopy.js' => 'c3e218fe',
     'rsrc/js/core/behavior-phabricator-nav.js' => 'b5842a5e',
     'rsrc/js/core/behavior-phabricator-remarkup-assist.js' => 'c021950a',
     'rsrc/js/core/behavior-refresh-csrf.js' => 'c4b31646',
@@ -505,7 +505,7 @@ return array(
     'conpherence-notification-css' => '403cf598',
     'conpherence-update-css' => '1099a660',
     'conpherence-widget-pane-css' => '87b12e0c',
-    'differential-changeset-view-css' => '6a0299e9',
+    'differential-changeset-view-css' => '1570a1ff',
     'differential-core-view-css' => '7ac3cabc',
     'differential-inline-comment-editor' => 'f2441746',
     'differential-results-table-css' => '239924f9',
@@ -596,7 +596,7 @@ return array(
     'javelin-behavior-phabricator-nav' => 'b5842a5e',
     'javelin-behavior-phabricator-notification-example' => 'c51a6616',
     'javelin-behavior-phabricator-object-selector' => 'b4eef37b',
-    'javelin-behavior-phabricator-oncopy' => 'e69e4400',
+    'javelin-behavior-phabricator-oncopy' => 'c3e218fe',
     'javelin-behavior-phabricator-remarkup-assist' => 'c021950a',
     'javelin-behavior-phabricator-reveal-content' => '8f24abfc',
     'javelin-behavior-phabricator-search-typeahead' => 'f6b56f7a',
@@ -1635,6 +1635,11 @@ return array(
       2 => 'javelin-util',
       3 => 'javelin-magical-init',
     ),
+    'c3e218fe' =>
+    array(
+      0 => 'javelin-behavior',
+      1 => 'javelin-dom',
+    ),
     'c4b31646' =>
     array(
       0 => 'javelin-request',
@@ -1810,11 +1815,6 @@ return array(
       2 => 'javelin-view-visitor',
       3 => 'javelin-util',
     ),
-    'e69e4400' =>
-    array(
-      0 => 'javelin-behavior',
-      1 => 'javelin-dom',
-    ),
     'e7c21fb3' =>
     array(
       0 => 'javelin-dom',

src/applications/differential/render/DifferentialChangesetTwoUpRenderer.php

@@ -284,11 +284,10 @@ final class DifferentialChangesetTwoUpRenderer
         $n_id = null;
       }
 
-      // NOTE: This is a unicode 'word joiner' (essentially a non-breaking
-      // zero-width space), which we use as a hint when intercepting 'copy'
-      // events to make sure sensible text ends up on the clipboard.
-      // See the 'phabricator-oncopy' behavior.
-      $zero_space = "\xE2\x81\xA0";
+      // NOTE: This is a unicode zero-width space, which we use as a hint when
+      // intercepting 'copy' events to make sure sensible text ends up on the
+      // clipboard. See the 'phabricator-oncopy' behavior.
+      $zero_space = "\xE2\x80\x8B";
 
       // NOTE: The Javascript is sensitive to whitespace changes in this
       // block!
@@ -301,7 +300,10 @@ final class DifferentialChangesetTwoUpRenderer
         phutil_tag(
           'td',
           array('class' => $n_classes, 'colspan' => $n_colspan),
-          array($zero_space, $n_text)),
+          array(
+            phutil_tag('span', array('class' => 'zwsp'), $zero_space),
+            $n_text
+          )),
         $n_cov,
       ));
 

src/applications/diffusion/controller/DiffusionBrowseFileController.php

@@ -789,7 +789,7 @@ final class DiffusionBrowseFileController extends DiffusionBrowseController {
           $anchor_text,
 
           // NOTE: See phabricator-oncopy behavior.
-          "\xE2\x81\xA0",
+          "\xE2\x80\x8B",
 
           // TODO: [HTML] Not ideal.
           phutil_safe_html(str_replace("\t", '  ', $line['data'])),

src/view/layout/PhabricatorSourceCodeView.php

@@ -62,7 +62,7 @@ final class PhabricatorSourceCodeView extends AphrontView {
       } else {
         $content_number = $line_number;
         // NOTE: See phabricator-oncopy behavior.
-        $content_line = hsprintf("\xE2\x81\xA0%s", $line);
+        $content_line = hsprintf("\xE2\x80\x8B%s", $line);
       }
 
       $row_attributes = array();

webroot/rsrc/css/application/differential/changeset-view.css

@@ -59,6 +59,11 @@
   line-height:        16px;
 }
 
+.differential-diff td .zwsp {
+  position: absolute;
+  width: 0;
+}
+
 .differential-diff th {
   text-align:         right;
   padding:            2px 6px 0px 0px;

webroot/rsrc/js/core/behavior-oncopy.js

@@ -16,7 +16,7 @@
  */
 JX.behavior('phabricator-oncopy', function() {
 
-  var zws = "\u2060"; // Unicode Word Joiner (Non-Breaking Zero-Width Space)
+  var zws = "\u200B"; // Unicode Zero-Width Space
 
   JX.enableDispatch(document.body, 'copy');
   JX.Stratcom.listen(