Add button to rescan BT devices

Otherwise the divecomputer has to be in pairing mode
at app start time.

Unfortunately, this leaves less space for the progress message.
My time/qml knowledge does not suffice to move that to the next line
(when moving that out of the RowLayout it overlaps with
the buttons).

Signed-off-by: Robert C. Helling <helling@atdotde.de>

CHANGELOG.md

@@ -1,3 +1,4 @@
+- Add button to recan for BT devices
 - Compute plan variations in background to improve responsiveness
 - Improve profile rescaling in planner
 - Store the gas switch depth of a cylinder from the planner in the logbook

mobile-widgets/qml/DownloadFromDiveComputer.qml

@@ -215,6 +215,14 @@ Kirigami.Page {
 					manager.appendTextToLog("exit DCDownload screen")
 				}
 			}
+			SsrfButton {
+				id:rescanbutton
+				text: qsTr("Rescan")
+				onClicked: {
+					manager.btRescan()
+				}
+			}
+
 			Controls.Label {
 				Layout.maximumWidth: parent.width - download.width - quitbutton.width
 				text: divesDownloaded ? qsTr(" Downloaded dives") :

mobile-widgets/qmlmanager.cpp

@@ -96,6 +96,11 @@ void QMLManager::btHostModeChange(QBluetoothLocalDevice::HostMode state)
 	emit btEnabledChanged();
 }
 
+void QMLManager::btRescan()
+{
+	BTDiscovery::instance()->BTDiscoveryReDiscover();
+}
+
 QMLManager::QMLManager() : m_locationServiceEnabled(false),
 	m_verboseEnabled(false),
 	reply(0),

mobile-widgets/qmlmanager.h

@@ -192,6 +192,8 @@ public slots:
 	void appendTextToLog(const QString &newText);
 	void quit();
 	void hasLocationSourceChanged();
+	void btRescan();
+
 
 private:
 	QString m_cloudUserName;