Upgraded jQuery to version 2

Closes #12440

app/assets/javascripts/application.js.coffee

@@ -4,7 +4,7 @@
 # It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
 # the compiled file.
 #
-#= require jquery
+#= require jquery2
 #= require jquery-ui/autocomplete
 #= require jquery-ui/datepicker
 #= require jquery-ui/draggable

vendor/assets/javascripts/task_list.js.coffee

+# The MIT License (MIT)
+#
+# Copyright (c) 2014 GitHub, Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# TaskList Behavior
+#
+#= provides tasklist:enabled
+#= provides tasklist:disabled
+#= provides tasklist:change
+#= provides tasklist:changed
+#
+#
+# Enables Task List update behavior.
+#
+# ### Example Markup
+#
+#   <div class="js-task-list-container">
+#     <ul class="task-list">
+#       <li class="task-list-item">
+#         <input type="checkbox" class="js-task-list-item-checkbox" disabled />
+#         text
+#       </li>
+#     </ul>
+#     <form>
+#       <textarea class="js-task-list-field">- [ ] text</textarea>
+#     </form>
+#   </div>
+#
+# ### Specification
+#
+# TaskLists MUST be contained in a `(div).js-task-list-container`.
+#
+# TaskList Items SHOULD be an a list (`UL`/`OL`) element.
+#
+# Task list items MUST match `(input).task-list-item-checkbox` and MUST be
+# `disabled` by default.
+#
+# TaskLists MUST have a `(textarea).js-task-list-field` form element whose
+# `value` attribute is the source (Markdown) to be udpated. The source MUST
+# follow the syntax guidelines.
+#
+# TaskList updates trigger `tasklist:change` events. If the change is
+# successful, `tasklist:changed` is fired. The change can be canceled.
+#
+# jQuery is required.
+#
+# ### Methods
+#
+# `.taskList('enable')` or `.taskList()`
+#
+# Enables TaskList updates for the container.
+#
+# `.taskList('disable')`
+#
+# Disables TaskList updates for the container.
+#
+## ### Events
+#
+# `tasklist:enabled`
+#
+# Fired when the TaskList is enabled.
+#
+# * **Synchronicity** Sync
+# * **Bubbles** Yes
+# * **Cancelable** No
+# * **Target** `.js-task-list-container`
+#
+# `tasklist:disabled`
+#
+# Fired when the TaskList is disabled.
+#
+# * **Synchronicity** Sync
+# * **Bubbles** Yes
+# * **Cancelable** No
+# * **Target** `.js-task-list-container`
+#
+# `tasklist:change`
+#
+# Fired before the TaskList item change takes affect.
+#
+# * **Synchronicity** Sync
+# * **Bubbles** Yes
+# * **Cancelable** Yes
+# * **Target** `.js-task-list-field`
+#
+# `tasklist:changed`
+#
+# Fired once the TaskList item change has taken affect.
+#
+# * **Synchronicity** Sync
+# * **Bubbles** Yes
+# * **Cancelable** No
+# * **Target** `.js-task-list-field`
+#
+# ### NOTE
+#
+# Task list checkboxes are rendered as disabled by default because rendered
+# user content is cached without regard for the viewer.
+
+incomplete = "[ ]"
+complete   = "[x]"
+
+# Escapes the String for regular expression matching.
+escapePattern = (str) ->
+  str.
+    replace(/([\[\]])/g, "\\$1"). # escape square brackets
+    replace(/\s/, "\\s").         # match all white space
+    replace("x", "[xX]")          # match all cases
+
+incompletePattern = ///
+  #{escapePattern(incomplete)}
+///
+completePattern = ///
+  #{escapePattern(complete)}
+///
+
+# Pattern used to identify all task list items.
+# Useful when you need iterate over all items.
+itemPattern = ///
+  ^
+  (?:                     # prefix, consisting of
+    \s*                   # optional leading whitespace
+    (?:>\s*)*             # zero or more blockquotes
+    (?:[-+*]|(?:\d+\.))   # list item indicator
+  )
+  \s*                     # optional whitespace prefix
+  (                       # checkbox
+    #{escapePattern(complete)}|
+    #{escapePattern(incomplete)}
+  )
+  \s+                     # is followed by whitespace
+  (?!
+    \(.*?\)               # is not part of a [foo](url) link
+  )
+  (?=                     # and is followed by zero or more links
+    (?:\[.*?\]\s*(?:\[.*?\]|\(.*?\))\s*)*
+    (?:[^\[]|$)           # and either a non-link or the end of the string
+  )
+///
+
+# Used to filter out code fences from the source for comparison only.
+# http://rubular.com/r/x5EwZVrloI
+# Modified slightly due to issues with JS
+codeFencesPattern = ///
+  ^`{3}           # ```
+    (?:\s*\w+)?   # followed by optional language
+    [\S\s]        # whitespace
+  .*              # code
+  [\S\s]          # whitespace
+  ^`{3}$          # ```
+///mg
+
+# Used to filter out potential mismatches (items not in lists).
+# http://rubular.com/r/OInl6CiePy
+itemsInParasPattern = ///
+  ^
+  (
+    #{escapePattern(complete)}|
+    #{escapePattern(incomplete)}
+  )
+  .+
+  $
+///g
+
+# Given the source text, updates the appropriate task list item to match the
+# given checked value.
+#
+# Returns the updated String text.
+updateTaskListItem = (source, itemIndex, checked) ->
+  clean = source.replace(/\r/g, '').replace(codeFencesPattern, '').
+    replace(itemsInParasPattern, '').split("\n")
+  index = 0
+  result = for line in source.split("\n")
+    if line in clean && line.match(itemPattern)
+      index += 1
+      if index == itemIndex
+        line =
+          if checked
+            line.replace(incompletePattern, complete)
+          else
+            line.replace(completePattern, incomplete)
+    line
+  result.join("\n")
+
+# Updates the $field value to reflect the state of $item.
+# Triggers the `tasklist:change` event before the value has changed, and fires
+# a `tasklist:changed` event once the value has changed.
+updateTaskList = ($item) ->
+  $container = $item.closest '.js-task-list-container'
+  $field     = $container.find '.js-task-list-field'
+  index      = 1 + $container.find('.task-list-item-checkbox').index($item)
+  checked    = $item.prop 'checked'
+
+  event = $.Event 'tasklist:change'
+  $field.trigger event, [index, checked]
+
+  unless event.isDefaultPrevented()
+    $field.val updateTaskListItem($field.val(), index, checked)
+    $field.trigger 'change'
+    $field.trigger 'tasklist:changed', [index, checked]
+
+# When the task list item checkbox is updated, submit the change
+$(document).on 'change', '.task-list-item-checkbox', ->
+  updateTaskList $(this)
+
+# Enables TaskList item changes.
+enableTaskList = ($container) ->
+  if $container.find('.js-task-list-field').length > 0
+    $container.
+      find('.task-list-item').addClass('enabled').
+      find('.task-list-item-checkbox').attr('disabled', null)
+    $container.addClass('is-task-list-enabled').
+      trigger 'tasklist:enabled'
+
+# Enables a collection of TaskList containers.
+enableTaskLists = ($containers) ->
+  for container in $containers
+    enableTaskList $(container)
+
+# Disable TaskList item changes.
+disableTaskList = ($container) ->
+  $container.
+    find('.task-list-item').removeClass('enabled').
+    find('.task-list-item-checkbox').attr('disabled', 'disabled')
+  $container.removeClass('is-task-list-enabled').
+    trigger 'tasklist:disabled'
+
+# Disables a collection of TaskList containers.
+disableTaskLists = ($containers) ->
+  for container in $containers
+    disableTaskList $(container)
+
+$.fn.taskList = (method) ->
+  $container = $(this).closest('.js-task-list-container')
+
+  methods =
+    enable: enableTaskLists
+    disable: disableTaskLists
+
+  methods[method || 'enable']($container)