close emoji autocompleter if space typed after : issue #433 and adds default option for emoji font family settings

resources/qml/MessageInput.qml

@@ -163,6 +163,10 @@ Rectangle {
                         TimelineManager.timeline.input.paste(false);
                         event.accepted = true;
                     } else if (event.key == Qt.Key_Space) {
+                        // close popup if user enters space after colon
+                        if(cursorPosition == completerTriggeredAt + 1)
+                            popup.close();
+
                         if (popup.opened && popup.count <= 0)
                             popup.close();
 

src/UserSettingsPage.cpp

@@ -725,6 +725,7 @@ UserSettingsPage::UserSettingsPage(QSharedPointer<UserSettings> settings, QWidge
         // TODO: Is there a way to limit to just emojis, rather than
         // all emoji fonts?
         auto emojiFamilies = fontDb.families(QFontDatabase::Symbol);
+        emojiFontSelectionCombo_->addItem(QString("default"));
         for (const auto &family : emojiFamilies) {
                 emojiFontSelectionCombo_->addItem(family);
         }