Find umlauts using search

TinyMCE currently escapes all special chatacters pretty unconviniently.
We now try to parse HTML using DOMParser and extract the text content so
we can actually search for it

client/src/app/app.component.ts

@@ -45,8 +45,17 @@ declare global {
     interface Number {
         modulo(n: number): number;
     }
+
+    interface String {
+        decode(): string;
+    }
 }
 
+/**
+ * May only be created once since this thing is fat
+ */
+const domParser = new DOMParser();
+
 /**
  * Angular's global App Component
  */
@@ -103,6 +112,7 @@ export class AppComponent {
         this.overloadSetFunctions();
         this.overloadModulo();
         this.loadCustomIcons();
+        this.overloadDecodeString();
 
         // Wait until the App reaches a stable state.
         // Required for the Service Worker.
@@ -198,6 +208,23 @@ export class AppComponent {
         });
     }
 
+    /**
+     * This is not the fastest solution but the most reliable one.
+     * Certain languages and TinyMCE do not follow the any predictable
+     * behaviour when it comes to encoding UTF8.
+     * decodeURI and decodeURIComponent were not able to successfully
+     * replace any ;&*uml with something meaningfull.
+     */
+    private overloadDecodeString(): void {
+        Object.defineProperty(String.prototype, 'decode', {
+            enumerable: false,
+            value(): string {
+                const doc = domParser.parseFromString(this, 'text/html');
+                return doc.body.textContent || '';
+            }
+        });
+    }
+
     /**
      * Enhances the number object with a real modulo operation (not remainder).
      * TODO: Remove this, if the remainder operation is changed to modulo.

client/src/app/site/motions/models/view-motion.ts

@@ -231,19 +231,25 @@ export class ViewMotion
         const properties: SearchProperty[] = [];
         properties.push({ key: 'Title', value: this.getTitle() });
         properties.push({ key: 'Submitters', value: this.submittersAsUsers.map(user => user.full_name).join(', ') });
-        properties.push({ key: 'Text', value: this.text, trusted: true });
-        properties.push({ key: 'Reason', value: this.reason, trusted: true });
+        properties.push({ key: 'Text', value: this.text.decode(), trusted: true });
+        properties.push({ key: 'Reason', value: this.reason.decode(), trusted: true });
         if (this.amendment_paragraphs) {
             properties.push({
                 key: 'Amendments',
-                value: this.amendment_paragraphs.filter(x => !!x).join('\n'),
+                value: this.amendment_paragraphs
+                    .filter(x => !!x)
+                    .join('\n')
+                    .decode(),
                 trusted: true
             });
         }
         properties.push({ key: 'Tags', value: this.tags.map(tag => tag.getTitle()).join(', ') });
         properties.push({
             key: 'Comments',
-            value: this.motion.comments.map(comment => comment.comment).join('\n'),
+            value: this.motion.comments
+                .map(comment => comment.comment)
+                .join('\n')
+                .decode(),
             trusted: true
         });
         properties.push({ key: 'Supporters', value: this.supporters.map(user => user.full_name).join(', ') });

client/src/app/site/topics/models/view-topic.ts

@@ -27,12 +27,14 @@ export class ViewTopic extends BaseViewModelWithAgendaItemAndListOfSpeakers<Topi
      * @override
      */
     public formatForSearch(): SearchRepresentation {
+        const properties = [
+            { key: 'Title', value: this.getTitle() },
+            { key: 'Text', value: this.text.decode(), trusted: true }
+        ];
+
         return {
-            properties: [
-                { key: 'Title', value: this.getTitle() },
-                { key: 'Text', value: this.text, trusted: true }
-            ],
-            searchValue: [this.getTitle(), this.text]
+            properties,
+            searchValue: properties.map(property => property.value)
         };
     }