Fix enable Connect when autoselect serail

Author: uutzinger

config.py

@@ -6,7 +6,7 @@
 from helpers.colors import color_names_sweet16 as COLORS
 ################################################################################################################################
 # Constants General
-VERSION                 = "1.5.0"               # this version
+VERSION                 = "1.5.1"                # this version
 AUTHOR                  = "Urs Utzinger"         # me
 DATE                    = "2026"                 # year of last update
 ################################################################################################################################

helpers/Qserial_helper.py

@@ -916,20 +916,27 @@ def on_newPortListReady(self, ports: list, portNames: list, portHWIDs: list) ->
         self.serialPortHWIDs = portHWIDs
 
         lenPortNames = len(self.serialPortNames)
+        selected_index = -1
         self.ui.comboBoxDropDown_SerialPorts.blockSignals(True)                # block the box from emitting changed index signal when items are added
         # populate new items
         self.ui.comboBoxDropDown_SerialPorts.clear()
         self.ui.comboBoxDropDown_SerialPorts.addItems(self.serialPorts + ["None"])
         index = self.ui.comboBoxDropDown_SerialPorts.findText(self.serialPort)
         if index > -1:                                                         # if we found previously selected item
+            selected_index = index
             self.ui.comboBoxDropDown_SerialPorts.setCurrentIndex(index)
         elif self.serialPorts:                                                 # default to the first available real port
+            selected_index = 0
             self.ui.comboBoxDropDown_SerialPorts.setCurrentIndex(0)
         else:                                                                  # no serial ports available, keep box on "None"
+            selected_index = lenPortNames
             self.ui.comboBoxDropDown_SerialPorts.setCurrentIndex(lenPortNames)
             self.serialPort_previous = ""
         # enable signals again
         self.ui.comboBoxDropDown_SerialPorts.blockSignals(False)
+        self.ui.pushButton_SerialOpenClose.setEnabled(
+            self.serialConnected or 0 <= selected_index < len(self.serialPorts)
+        )
 
         self.logSignal.emit(logging.DEBUG,
             f"[{self.instance_name[:15]:<15}]: Port list received."