Revert to using links instead of buttons in Issuable Index tabs.

app/assets/javascripts/filtered_search/filtered_search_manager.js

@@ -487,6 +487,7 @@ class FilteredSearchManager {
   }
 
   searchState(e) {
+    e.preventDefault();
     const target = e.currentTarget;
     // remove focus outline after click
     target.blur();

app/assets/stylesheets/framework/nav.scss

@@ -45,8 +45,7 @@
   li {
     display: flex;
 
-    a,
-    .btn-link {
+    a {
       padding: $gl-btn-padding;
       padding-bottom: 11px;
       font-size: 14px;
@@ -68,29 +67,7 @@
       }
     }
 
-    .btn-link {
-      padding-top: 16px;
-      padding-left: 15px;
-      padding-right: 15px;
-      border-left: none;
-      border-right: none;
-      border-top: none;
-      border-radius: 0;
-
-      &:hover,
-      &:active,
-      &:focus {
-        background-color: transparent;
-      }
-
-      &:active {
-        outline: 0;
-        box-shadow: none;
-      }
-    }
-
-    &.active a,
-    &.active .btn-link {
+    &.active a {
       border-bottom: 2px solid $link-underline-blue;
       color: $black;
       font-weight: 600;

app/views/shared/issuable/_nav.html.haml

 - type = local_assigns.fetch(:type, :issues)
 - page_context_word = type.to_s.humanize(capitalize: false)
 - issuables = @issues || @merge_requests
-- closed_title = 'Filter by issues that are currently closed.'
 
 %ul.nav-links.issues-state-filters
   %li{ class: active_when(params[:state] == 'opened') }>
-    %button.btn.btn-link{ id: 'state-opened', title: "Filter by #{page_context_word} that are currently opened.", type: 'button', data: { state: 'opened' } }
+    = link_to page_filter_path(state: 'opened', label: true), id: 'state-opened', title: "Filter by #{page_context_word} that are currently opened.", data: { state: 'opened' } do
       #{issuables_state_counter_text(type, :opened)}
 
   - if type == :merge_requests
     %li{ class: active_when(params[:state] == 'merged') }>
-      %button.btn.btn-link{ id: 'state-merged', title: 'Filter by merge requests that are currently merged.', type: 'button', data: { state: 'merged' } }
+      = link_to page_filter_path(state: 'merged', label: true), id: 'state-merged', title: 'Filter by merge requests that are currently merged.', data: { state: 'merged' } do
         #{issuables_state_counter_text(type, :merged)}
 
-    - closed_title = 'Filter by merge requests that are currently closed and unmerged.'
-
     %li{ class: active_when(params[:state] == 'closed') }>
-    %button.btn.btn-link{ id: 'state-closed', title: closed_title, type: 'button', data: { state: 'closed' } }
+      = link_to page_filter_path(state: 'closed', label: true), id: 'state-closed', title: 'Filter by merge requests that are currently closed and unmerged.', data: { state: 'closed' } do
+        #{issuables_state_counter_text(type, :closed)}
+  - else
+    %li{ class: active_when(params[:state] == 'closed') }>
+      = link_to page_filter_path(state: 'closed', label: true), id: 'state-all', title: 'Filter by issues that are currently closed.', data: { state: 'closed' } do
         #{issuables_state_counter_text(type, :closed)}
 
   %li{ class: active_when(params[:state] == 'all') }>
-    %button.btn.btn-link{ id: 'state-all', title: "Show all #{page_context_word}.", type: 'button', data: { state: 'all' } }
+    = link_to page_filter_path(state: 'all', label: true), id: 'state-all', title: "Show all #{page_context_word}.", data: { state: 'all' } do
       #{issuables_state_counter_text(type, :all)}

spec/javascripts/filtered_search/filtered_search_manager_spec.js

@@ -106,6 +106,7 @@ describe('Filtered Search Manager', () => {
 
     it('should blur button', () => {
       const e = {
+        preventDefault: () => {},
         currentTarget: {
           blur: () => {},
         },
@@ -118,6 +119,7 @@ describe('Filtered Search Manager', () => {
 
     it('should not call search if there is no state', () => {
       const e = {
+        preventDefault: () => {},
         currentTarget: {
           blur: () => {},
         },
@@ -129,6 +131,7 @@ describe('Filtered Search Manager', () => {
 
     it('should call search when there is state', () => {
       const e = {
+        preventDefault: () => {},
         currentTarget: {
           blur: () => {},
           dataset: {