FEATURE: add an option to create undismissable modals

app/assets/javascripts/discourse/components/d-modal-body.js.es6

@@ -1,6 +1,7 @@
 export default Ember.Component.extend({
   classNames: ['modal-body'],
   fixed: false,
+  dismissable: true,
 
   didInsertElement() {
     this._super();
@@ -44,7 +45,8 @@ export default Ember.Component.extend({
         'rawTitle',
         'fixed',
         'subtitle',
-        'rawSubtitle'
+        'rawSubtitle',
+        'dismissable'
       )
     );
   },

app/assets/javascripts/discourse/components/d-modal.js.es6

@@ -3,6 +3,7 @@ import { on } from "ember-addons/ember-computed-decorators";
 export default Ember.Component.extend({
   classNameBindings: [':modal', ':d-modal', 'modalClass', 'modalStyle'],
   attributeBindings: ['data-keyboard'],
+  dismissable: true,
 
   init() {
     this._super(...arguments);
@@ -21,7 +22,7 @@ export default Ember.Component.extend({
   @on("didInsertElement")
   setUp() {
     $('html').on('keydown.discourse-modal', e => {
-      if (e.which === 27) {
+      if (e.which === 27 && this.get('dismissable')) {
         Em.run.next(() => $('.modal-header a.close').click());
       }
     });
@@ -48,6 +49,12 @@ export default Ember.Component.extend({
         // of another modal is not used
         this.set('subtitle', null);
       }
+
+      if ('dismissable' in data) {
+        this.set('dismissable', data.dismissable);
+      } else {
+        this.set('dismissable', true);
+      }
     });
   },
 
@@ -57,6 +64,9 @@ export default Ember.Component.extend({
   },
 
   click(e) {
+    if(!this.get('dismissable')) {
+      return;
+    }
     const $target = $(e.target);
     if ($target.hasClass("modal-middle-container") ||
         $target.hasClass("modal-outer-container")) {

app/assets/javascripts/discourse/templates/components/d-modal.hbs

@@ -2,9 +2,11 @@
   <div class="modal-middle-container">
     <div class="modal-inner-container">
       <div class="modal-header">
-        <div class='modal-close'>
-          <a class="close" {{action closeModal}}>{{d-icon "times"}}</a>
-        </div>
+        {{#if dismissable}}
+          <div class='modal-close'>
+            <a class="close" {{action closeModal}}>{{d-icon "times"}}</a>
+          </div>
+        {{/if}}
 
         <div class="title">
           <h3>{{title}}</h3>