Add dynamic sizing for dropdown toggle, update Changelog.

Also resolve feedback.

CHANGELOG

@@ -57,6 +57,7 @@ v 8.11.0 (unreleased)
   - Trigram indexes for the "ci_runners" table have been removed to speed up UPDATE queries
   - Fix devise deprecation warnings.
   - Update version_sorter and use new interface for faster tag sorting
+  - Load branches asynchronously in Cherry Pick and Revert dialogs.
   - Optimize checking if a user has read access to a list of issues !5370
   - Store all DB secrets in secrets.yml, under descriptive names !5274
   - Nokogiri's various parsing methods are now instrumented

app/assets/stylesheets/framework/dropdowns.scss

@@ -84,6 +84,15 @@
       width: 100%;
     }
   }
+
+  // Allows dynamic-width text in the dropdown toggle.
+  // Resizes to allow long text without overflowing the container.
+  &.dynamic {
+    width: auto;
+    min-width: 160px;
+    max-width: 100%;
+    padding-right: 25px;
+  }
 }
 
 .dropdown-menu,

app/views/projects/commit/_change.html.haml

@@ -18,7 +18,7 @@
             = label_tag 'target_branch', target_label, class: 'control-label'
             .col-sm-10
               = hidden_field_tag :target_branch, @project.default_branch, id: 'target_branch'
-              = dropdown_tag(@project.default_branch, options: { title: "Switch branch", filter: true, placeholder: "Search branches", toggle_class: 'js-project-refs-dropdown js-target-branch', dropdown_class: 'dropdown-menu-selectable', data: { field_name: "target_branch", selected: @project.default_branch, target_branch: @project.default_branch, refs_url: namespace_project_branches_path(@project.namespace, @project), submit_form_on_click: false }})
+              = dropdown_tag(@project.default_branch, options: { title: "Switch branch", filter: true, placeholder: "Search branches", toggle_class: 'js-project-refs-dropdown js-target-branch dynamic', dropdown_class: 'dropdown-menu-selectable', data: { field_name: "target_branch", selected: @project.default_branch, target_branch: @project.default_branch, refs_url: namespace_project_branches_path(@project.namespace, @project), submit_form_on_click: false }})
 
               - if can?(current_user, :push_code, @project)
                 .js-create-merge-request-container