Improve user friendliness of changing chat widget channel/opening new chat widget

src/widgets/chatwidget.cpp

@@ -157,18 +157,26 @@ LimitedQueueSnapshot<SharedMessageRef> ChatWidget::getMessagesSnapshot()
     return this->messages.getSnapshot();
 }
 
-void ChatWidget::showChangeChannelPopup()
+bool ChatWidget::showChangeChannelPopup(const char *dialogTitle, bool empty)
 {
     // create new input dialog and execute it
     TextInputDialog dialog(this);
 
-    dialog.setText(QString::fromStdString(this->channelName));
+    dialog.setWindowTitle(dialogTitle);
+
+    if (!empty) {
+        dialog.setText(QString::fromStdString(this->channelName));
+    }
 
     if (dialog.exec() == QDialog::Accepted) {
         QString newChannelName = dialog.getText().trimmed();
 
         this->channelName = newChannelName.toStdString();
+
+        return true;
     }
+
+    return false;
 }
 
 void ChatWidget::layoutMessages(bool forceUpdate)
@@ -229,7 +237,7 @@ void ChatWidget::doCloseSplit()
 
 void ChatWidget::doChangeChannel()
 {
-    this->showChangeChannelPopup();
+    this->showChangeChannelPopup("Change channel");
 }
 
 void ChatWidget::doPopup()

src/widgets/chatwidget.hpp

@@ -48,7 +48,7 @@ public:
     std::shared_ptr<Channel> getChannel() const;
     std::shared_ptr<Channel> &getChannelRef();
 
-    void showChangeChannelPopup();
+    bool showChangeChannelPopup(const char *dialogTitle, bool empty = false);
     messages::LimitedQueueSnapshot<messages::SharedMessageRef> getMessagesSnapshot();
     void layoutMessages(bool forceUpdate = false);
     void updateGifEmotes();

src/widgets/chatwidgetheader.cpp

@@ -132,7 +132,7 @@ void ChatWidgetHeader::mouseMoveEvent(QMouseEvent *event)
 void ChatWidgetHeader::mouseDoubleClickEvent(QMouseEvent *event)
 {
     if (event->button() == Qt::LeftButton) {
-        this->chatWidget->showChangeChannelPopup();
+        this->chatWidget->showChangeChannelPopup("Change channel");
     }
 }
 

src/widgets/notebookpage.cpp

@@ -123,7 +123,12 @@ void NotebookPage::addChat(bool openChannelNameDialog)
     ChatWidget *w = this->createChatWidget();
 
     if (openChannelNameDialog) {
-        w->showChangeChannelPopup();
+        bool ret = w->showChangeChannelPopup("Open channel", true);
+
+        if (!ret) {
+            delete w;
+            return;
+        }
     }
 
     this->addToLayout(w, std::pair<int, int>(-1, -1));