Merge branch '24877-bulk-edit-only-keeps-common-labels-when-searching' into 'master'

Improve bulk assignment

This MR improves current implementation of Label dropdown when used for bulk assignment on issuable pages (/:namespace/:project/issues, /:namespace/:project/merge_requests)

Previously this dropdown relied on `<input>` tags to get its active items and also to calculate items with indeterminate state.

Relying on `<input>` tags is not enough when we want to set/get multiple states on a dropdown.

For this case we want to get/set:

- Marked items 
- Unmarked items that were initially marked
- Unmarked items that were initially indeterminate
- Items with indeterminate state.

This MR makes the Label dropdown to save its own state as `data` so it will be easy to get and set whatever state we want no matter if the dropdown is filtering which is the issue that I initially wanted to solve as you can see in the following gif.

**Before** 
![2016-12-07_11.44.48](/uploads/cb697161b8b39cdee72fdbb95a531100/2016-12-07_11.44.48.gif)

**After**
![2016-12-07_11.32.43](/uploads/338255a302de0dd1367474f33232d2a3/2016-12-07_11.32.43.gif)

As you can see in the first gif the `bug` label is removed from the selected issues but the `enhancement` label should set but the `critical` should be kept. This is fixed on the next gif.

Fixes #24877

See merge request !7765

1 files changed, 3 insertions, 5 deletions

diff --git a/app/assets/javascripts/dispatcher.js.es6 b/app/assets/javascripts/dispatcher.js.es6
index 7d588e8eee6..1ec950494ff 100644
--- a/app/assets/javascripts/dispatcher.js.es6
+++ b/app/assets/javascripts/dispatcher.js.es6
@@ -74,7 +74,9 @@
         case 'projects:merge_requests:index':
         case 'projects:issues:index':
           Issuable.init();
-          new gl.IssuableBulkActions();
+          new gl.IssuableBulkActions({
+            prefixId: page === 'projects:merge_requests:index' ?  'merge_request_' : 'issue_'
+          });
           shortcut_handler = new ShortcutsNavigation();
           break;
         case 'projects:issues:show':
@@ -144,10 +146,6 @@
           new ZenMode();
           new MergedButtons();
           break;
-        case 'projects:merge_requests:index':
-          shortcut_handler = new ShortcutsNavigation();
-          Issuable.init();
-          break;
         case 'dashboard:activity':
           new gl.Activities();
           break;