Fix main window tab navigation accessibility issue:

1) Dashboard -> Server Activity grid: terminate the session, cancel active button not navigable using tab key.
2) SQL -> If the focus inside code mirror control tab navigation not working.

Fixes #4930

docs/en_US/release_notes_4_16.rst

@@ -19,5 +19,6 @@ Bug fixes
 
 | `Issue #4792 <https://redmine.postgresql.org/issues/4792>`_ - Ensure that the superuser should be able to create database, as the superuser overrides all the access restrictions.
 | `Issue #4878 <https://redmine.postgresql.org/issues/4878>`_ - Ensure that the superuser should be able to create role, as the superuser overrides all the access restrictions.
+| `Issue #4930 <https://redmine.postgresql.org/issues/4930>`_ - Fix main window tab navigation accessibility issue.
 | `Issue #4934 <https://redmine.postgresql.org/issues/4934>`_ - Fix the help button link on the User Management dialog.
 | `Issue #4935 <https://redmine.postgresql.org/issues/4935>`_ - Fix accessibility issues.

web/pgadmin/browser/static/js/keyboard.js

@@ -134,7 +134,7 @@ _.extend(pgBrowser.keyboardNavigation, {
   bindRightPanel: function(event, combo) {
     let allPanels = pgAdmin.Browser.docker.findPanels();
     let activePanel = 0;
-    let nextPanel = allPanels.length;
+    let nextPanel = allPanels.length - 1;
     let prevPanel = 1;
     let activePanelId = 0;
     let activePanelFlag = false;

web/pgadmin/dashboard/static/js/dashboard.js

@@ -52,6 +52,13 @@ define('pgadmin.dashboard', [
           '\'></i>'
         );
       }
+      this.$el.attr('tabindex', 0);
+      this.$el.on('keydown', function(e) {
+        // terminating session or cancel the active query.
+        if (e.keyCode == 32) {
+          self.$el.click();
+        }
+      }),
       this.delegateEvents();
       return this;
     },

web/pgadmin/static/bundle/codemirror.js

@@ -26,4 +26,16 @@ import 'codemirror/addon/comment/comment';
 import 'sources/codemirror/addon/fold/pgadmin-sqlfoldcode';
 import 'sources/codemirror/extension/centre_on_line';
 
+var cmds = CodeMirror.commands;
+cmds.focusOut = function(){
+  event.stopPropagation();
+  document.activeElement.blur();
+  if(event.currentTarget.parents().find('.sql-code-control')) {
+    // for code mirror in dialogs
+    event.currentTarget.parents().find('.sql-code-control').focus();
+  }
+};
+
+CodeMirror.keyMap.default['Esc'] = 'focusOut';
+
 export default CodeMirror;

web/pgadmin/static/scss/_pgadmin.style.scss

@@ -626,6 +626,10 @@ fieldset.inline-fieldset > div {
     height: 100%;
   }
 
+  & .btn-secondary:focus {
+    box-shadow: $input-btn-focus-box-shadow;
+  }
+
   & .input-group {
     & .input-group-text {
       background: $input-bg;