Merge branch 'add-shortcut-to-copy-file-content-hash-link' into 'master'

Add shortcut to copy file content hash link

## What does this MR do?

* Allows for multiple shortcut handlers to be initialised
* Adds `y` shortcut to file pages to copy permalink URL.

## Are there points in the code the reviewer needs to double check?

Ney.

## Why was this MR needed?

UX

## What are the relevant issue numbers?

Closes #14470.

## Screenshots (if relevant)

![y-shortcut](/uploads/b81feb26d8e0d7d4996c4afa29f385d7/y-shortcut.gif)

See merge request !4496

CHANGELOG

@@ -27,6 +27,7 @@ v 8.9.0 (unreleased)
   - Add a metric for the number of new Redis connections created by a transaction
   - Fix Error 500 when viewing a blob with binary characters after the 1024-byte mark
   - Redesign navigation for project pages
+  - Added shortcut 'y' for copying a files content hash URL #14470
   - Fix groups API to list only user's accessible projects
   - Add Environments and Deployments
   - Redesign account and email confirmation emails

app/assets/javascripts/dispatcher.js.coffee

@@ -98,6 +98,7 @@ class Dispatcher
       when 'projects:blob:show', 'projects:blame:show'
         new LineHighlighter()
         shortcut_handler = new ShortcutsNavigation()
+        new ShortcutsBlob true
       when 'projects:labels:new', 'projects:labels:edit'
         new Labels()
       when 'projects:labels:index'

app/assets/javascripts/shortcuts.js.coffee

 class @Shortcuts
-  constructor: ->
+  constructor: (skipResetBindings) ->
     @enabledHelp = []
-    Mousetrap.reset()
+    Mousetrap.reset() if not skipResetBindings
     Mousetrap.bind('?', @onToggleHelp)
     Mousetrap.bind('s', Shortcuts.focusSearch)
     Mousetrap.bind(['ctrl+shift+p', 'command+shift+p'], @toggleMarkdownPreview)

app/assets/javascripts/shortcuts_blob.coffee

+#= require shortcuts
+
+class @ShortcutsBlob extends Shortcuts
+  constructor: (skipResetBindings) ->
+    super skipResetBindings
+    Mousetrap.bind('y', ShortcutsBlob.copyToClipboard)
+
+  @copyToClipboard: ->
+    clipboardButton = $('.btn-clipboard')
+    clipboardButton.click() if clipboardButton