On inline comments, track an explicit "committed" content state

Summary:
Ref T13559. To allow the client to make correct decisions about what buttons mean, track an explicit "Committed" content state.

This is the last version of the comment that has been saved on the server, and does not exist if the comment has never been saved.

Test Plan: Created comments, etc. See followups.

Maniphest Tasks: T13559

Differential Revision: https://secure.phabricator.com/D21651

resources/celerity/map.php

@@ -10,10 +10,10 @@ return array(
     'conpherence.pkg.css' => '0e3cf785',
     'conpherence.pkg.js' => '020aebcf',
     'core.pkg.css' => '0ae696de',
-    'core.pkg.js' => 'ab3502fe',
+    'core.pkg.js' => '68f29322',
     'dark-console.pkg.js' => '187792c2',
     'differential.pkg.css' => 'ffb69e3d',
-    'differential.pkg.js' => 'fdec5f60',
+    'differential.pkg.js' => 'bbf6d742',
     'diffusion.pkg.css' => '42c75c37',
     'diffusion.pkg.js' => '78c9885d',
     'maniphest.pkg.css' => '35995d6d',
@@ -253,7 +253,7 @@ return array(
     'rsrc/externals/javelin/lib/Mask.js' => '7c4d8998',
     'rsrc/externals/javelin/lib/Quicksand.js' => 'd3799cb4',
     'rsrc/externals/javelin/lib/Request.js' => '84e6891f',
-    'rsrc/externals/javelin/lib/Resource.js' => '740956e1',
+    'rsrc/externals/javelin/lib/Resource.js' => '20514cc2',
     'rsrc/externals/javelin/lib/Routable.js' => '6a18c42e',
     'rsrc/externals/javelin/lib/Router.js' => '32755edb',
     'rsrc/externals/javelin/lib/Scrollbar.js' => 'a43ae2ae',
@@ -385,7 +385,7 @@ return array(
     'rsrc/js/application/dashboard/behavior-dashboard-tab-panel.js' => '0116d3e8',
     'rsrc/js/application/diff/DiffChangeset.js' => 'd7d3ba75',
     'rsrc/js/application/diff/DiffChangesetList.js' => 'cc2c5de5',
-    'rsrc/js/application/diff/DiffInline.js' => '2a6fac17',
+    'rsrc/js/application/diff/DiffInline.js' => 'c794b624',
     'rsrc/js/application/diff/DiffInlineContentState.js' => '68e6339d',
     'rsrc/js/application/diff/DiffPathView.js' => '8207abf9',
     'rsrc/js/application/diff/DiffTreeView.js' => '5d83623b',
@@ -734,7 +734,7 @@ return array(
     'javelin-reactor-node-calmer' => '225bbb98',
     'javelin-reactornode' => '72960bc1',
     'javelin-request' => '84e6891f',
-    'javelin-resource' => '740956e1',
+    'javelin-resource' => '20514cc2',
     'javelin-routable' => '6a18c42e',
     'javelin-router' => '32755edb',
     'javelin-scrollbar' => 'a43ae2ae',
@@ -788,7 +788,7 @@ return array(
     'phabricator-dashboard-css' => '5a205b9d',
     'phabricator-diff-changeset' => 'd7d3ba75',
     'phabricator-diff-changeset-list' => 'cc2c5de5',
-    'phabricator-diff-inline' => '2a6fac17',
+    'phabricator-diff-inline' => 'c794b624',
     'phabricator-diff-inline-content-state' => '68e6339d',
     'phabricator-diff-path-view' => '8207abf9',
     'phabricator-diff-tree-view' => '5d83623b',
@@ -1106,6 +1106,11 @@ return array(
       'javelin-behavior',
       'javelin-request',
     ),
+    '20514cc2' => array(
+      'javelin-util',
+      'javelin-uri',
+      'javelin-install',
+    ),
     '225bbb98' => array(
       'javelin-install',
       'javelin-reactor',
@@ -1166,10 +1171,6 @@ return array(
       'javelin-stratcom',
       'javelin-behavior',
     ),
-    '2a6fac17' => array(
-      'javelin-dom',
-      'phabricator-diff-inline-content-state',
-    ),
     '2a8b62d9' => array(
       'multirow-row-manager',
       'javelin-install',
@@ -1597,11 +1598,6 @@ return array(
       'javelin-stratcom',
       'phabricator-tooltip',
     ),
-    '740956e1' => array(
-      'javelin-util',
-      'javelin-uri',
-      'javelin-install',
-    ),
     74446546 => array(
       'javelin-behavior',
       'javelin-dom',
@@ -2092,6 +2088,10 @@ return array(
       'javelin-workflow',
       'javelin-json',
     ),
+    'c794b624' => array(
+      'javelin-dom',
+      'phabricator-diff-inline-content-state',
+    ),
     'cc2c5de5' => array(
       'javelin-install',
       'phuix-button-view',

webroot/rsrc/externals/javelin/lib/Resource.js

@@ -149,6 +149,10 @@ JX.install('Resource', {
         }
       }
 
+      for (var jj = 0; jj < errors.length; jj++) {
+        JX.log(errors[jj]);
+      }
+
       if (errors.length) {
         throw errors[0];
       }

webroot/rsrc/js/application/diff/DiffInline.js

@@ -9,6 +9,7 @@ JX.install('DiffInline', {
 
   construct : function() {
     this._activeContentState = new JX.DiffInlineContentState();
+    this._committedContentState = new JX.DiffInlineContentState();
   },
 
   members: {
@@ -21,7 +22,6 @@ JX.install('DiffInline', {
     _displaySide: null,
     _isNewFile: null,
     _replyToCommentPHID: null,
-    _originalState: null,
     _snippet: null,
     _menuItems: null,
     _documentEngineKey: null,
@@ -56,6 +56,7 @@ JX.install('DiffInline', {
     _isSelected: false,
     _canSuggestEdit: false,
 
+    _committedContentState: null,
     _activeContentState: null,
 
     bindToRow: function(row) {
@@ -336,8 +337,6 @@ JX.install('DiffInline', {
       this._phid = null;
       this._isCollapsed = false;
 
-      this._originalState = null;
-
       return row;
     },
 
@@ -602,7 +601,10 @@ JX.install('DiffInline', {
 
     _readInlineState: function(state) {
       this._id = state.id;
-      this._originalState = state.contentState;
+
+      // TODO: This is not the correct content state after a reload: it is
+      // the draft state.
+      this._getCommittedContentState().readWireFormat(state.contentState);
 
       this._getActiveContentState().readWireFormat(state.contentState);
 
@@ -673,7 +675,10 @@ JX.install('DiffInline', {
       this._editRow = this._drawRows(rows, null, 'edit');
 
       this._drawSuggestionState(this._editRow);
-      this.setHasSuggestion(this._originalState.hasSuggestion);
+
+      // TODO: We're just doing this for the rendering side effect of drawing
+      // the button text.
+      this.setHasSuggestion(this.getHasSuggestion());
     },
 
     _drawRows: function(rows, cursor, type) {
@@ -800,6 +805,10 @@ JX.install('DiffInline', {
       return state;
     },
 
+    _getCommittedContentState: function() {
+      return this._committedContentState;
+    },
+
     setHasSuggestion: function(has_suggestion) {
       var state = this._getActiveContentState();
       state.setHasSuggestion(has_suggestion);
@@ -853,12 +862,13 @@ JX.install('DiffInline', {
     },
 
     _shouldUndoOnCancel: function() {
-      var state = this._getActiveContentState().getWireFormat();
+      var new_state = this._getActiveContentState().getWireFormat();
+      var old_state = this._getCommittedContentState().getWireFormat();
 
       // TODO: This is also simplified.
 
-      var is_empty = this._isVoidContentState(state);
+      var is_empty = this._isVoidContentState(new_state);
-      var is_same = this._isSameContentState(state, this._originalState);
+      var is_same = this._isSameContentState(new_state, old_state);
 
       if (!is_empty && !is_same) {
         return true;
@@ -956,7 +966,8 @@ JX.install('DiffInline', {
       this.setEditing(false);
       this.setInvisible(false);
 
-      this._applyCancel(this._originalState);
+      var old_state = this._getCommittedContentState();
+      this._applyCancel(old_state.getWireFormat());
 
       this._didUpdate(true);
     },
@@ -1184,6 +1195,9 @@ JX.install('DiffInline', {
     },
 
     _isVoidContentState: function(state) {
+      if (!state.text) {
+        return true;
+      }
       return (!state.text.length && !state.suggestionText.length);
     },