Simplify code a bit

resources/qml/TimelineView.qml

@@ -167,7 +167,6 @@ Item {
         }
 
         MessageInput {
-            id: input
         }
 
     }

src/CompletionProxyModel.h

@@ -184,8 +184,6 @@ public slots:
     void setSearchString(const QString &s);
     QString searchString() const { return searchString_; }
 
-    bool hasCompletion() const { return rowCount() > 0; }
-
 signals:
     void newSearchString(QString);
 

src/timeline/InputBar.cpp

@@ -390,8 +390,7 @@ InputBar::send()
 
     auto wasEdit = !room->edit().isEmpty();
 
-    auto [commandName, args] = getCommandAndArgs();
-    if (commandName.isNull())
+    if (auto [commandName, args] = getCommandAndArgs(); commandName.isNull())
         message(text());
     else
         command(commandName, args);