qml: add is_imported attribute to channel list item, show different icon

if channel backup is imported

electrum/gui/qml/components/controls/ChannelDelegate.qml

@@ -37,7 +37,9 @@ ItemDelegate {
         Image {
             id: walleticon
             source: model.is_backup
-                        ? '../../../icons/nocloud.png'
+                        ? model.is_imported
+                            ? '../../../icons/nocloud.png'
+                            : '../../../icons/lightning_disconnected.png'
                         : model.is_trampoline
                             ? '../../../icons/kangaroo.png'
                             : '../../../icons/lightning.png'

electrum/gui/qml/qechannellistmodel.py

@@ -17,7 +17,7 @@ class QEChannelListModel(QAbstractListModel, QtEventListener):
     _ROLE_NAMES=('cid','state','state_code','initiator','capacity','can_send',
                  'can_receive','l_csv_delay','r_csv_delay','send_frozen','receive_frozen',
                  'type','node_id','node_alias','short_cid','funding_tx','is_trampoline',
-                 'is_backup')
+                 'is_backup', 'is_imported')
     _ROLE_KEYS = range(Qt.UserRole, Qt.UserRole + len(_ROLE_NAMES))
     _ROLE_MAP  = dict(zip(_ROLE_KEYS, [bytearray(x.encode()) for x in _ROLE_NAMES]))
     _ROLE_RMAP = dict(zip(_ROLE_NAMES, _ROLE_KEYS))
@@ -86,9 +86,11 @@ class QEChannelListModel(QAbstractListModel, QtEventListener):
         if lnc.is_backup():
             item['can_send'] = QEAmount()
             item['can_receive'] = QEAmount()
+            item['is_imported'] = lnc.is_imported
         else:
             item['can_send'] = QEAmount(amount_msat=lnc.available_to_spend(LOCAL))
             item['can_receive'] = QEAmount(amount_msat=lnc.available_to_spend(REMOTE))
+            item['is_imported'] = False
         return item
 
     numOpenChannelsChanged = pyqtSignal()