calls: remove hold/pause call button for conference calls

Change-Id: I886fe081b21c12688109ddf268bb27de404997d4

callwidget.cpp

@@ -1231,7 +1231,12 @@ CallWidget::selectConversation(const lrc::api::conversation::Info& item)
         accInfo.conversationModel->selectConversation(item.uid);
         accInfo.conversationModel->clearUnreadInteractions(item.uid);
         if (!item.callId.empty()) {
-            accInfo.callModel->setCurrentCall(item.callId);
+            QtConcurrent::run(
+                [convUid=item.uid, accId=item.accountId] {
+                    auto item = LRCInstance::getConversationFromConvUid(convUid);
+                    auto& accInfo = LRCInstance::getAccountInfo(item.accountId);
+                    accInfo.callModel->setCurrentCall(item.callId);
+                });
         }
         ui->conversationsFilterWidget->update();
         return true;

videooverlay.cpp

@@ -62,6 +62,9 @@ VideoOverlay::VideoOverlay(QWidget* parent)
             this, &VideoOverlay::slotWillDoTransfer);
     connect(sipInputPanel_, &SipInputPanel::sipInputPanelClicked,
             this, &VideoOverlay::slotSIPInputPanelClicked);
+
+    ui->holdButton->setVisible(false);
+
 }
 
 VideoOverlay::~VideoOverlay()
@@ -119,6 +122,9 @@ VideoOverlay::updateCall(const conversation::Info& convInfo)
     ui->addToConferenceButton->setVisible(!isSIP);
     ui->transferCallButton->setVisible(isSIP);
     ui->sipInputPanelButton->setVisible(isSIP);
+
+    // only show the hold/pause button for non-conference calls
+    ui->holdButton->setVisible(convInfo.confId.empty());
 }
 
 void