GUI: add a spinbox to pre-dial the simulated Pot's reset temperature

btn_pot_reset always reset the simulated Pot to the ambient
temperature. Add doubleSpinBox_pot_temp next to it (shown/hidden
together, same as the button) so the user can dial in a different
starting temperature before committing it - it seeds from the same
remembered ambient value on startup but is otherwise independent and
not persisted.

tasks/pot.py's PotTask.recv() now resets the plant to whatever
temperature the 'Reset' message carries, falling back to ambient for
the bare True a caller might still send.

client/brewpi.ui

@@ -3755,6 +3755,47 @@
      <string>Pot reset to ambient temperature</string>
     </property>
    </widget>
+   <widget class="QLabel" name="label_pot_temp">
+    <property name="geometry">
+     <rect>
+      <x>930</x>
+      <y>500</y>
+      <width>91</width>
+      <height>31</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Pot [°C]</string>
+    </property>
+    <property name="alignment">
+     <set>Qt::AlignCenter</set>
+    </property>
+   </widget>
+   <widget class="QDoubleSpinBox" name="doubleSpinBox_pot_temp">
+    <property name="geometry">
+     <rect>
+      <x>1030</x>
+      <y>500</y>
+      <width>70</width>
+      <height>31</height>
+     </rect>
+    </property>
+    <property name="toolTip">
+     <string>Pre-dial the temperature btn_pot_reset applies to the simulated Pot</string>
+    </property>
+    <property name="decimals">
+     <number>0</number>
+    </property>
+    <property name="minimum">
+     <double>-999.000000000000000</double>
+    </property>
+    <property name="maximum">
+     <double>999.000000000000000</double>
+    </property>
+    <property name="singleStep">
+     <double>1.000000000000000</double>
+    </property>
+   </widget>
    <widget class="QLabel" name="label_8">
     <property name="geometry">
      <rect>

client/brewpi_gui.py

@@ -375,10 +375,19 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 			self.doubleSpinBox_ambient.setValue(remembered_ambient)
 			self.doubleSpinBox_ambient.blockSignals(False)
 		self.doubleSpinBox_ambient.valueChanged.connect(self.on_ambient_entry_changed)
+		# Pre-dial the Pot reset target at the same starting point btn_pot_
+		# reset used to hardcode (ambient) - purely a one-off starting value
+		# for the user to optionally dial away from before clicking the
+		# button, so unlike the ambient spinbox it's never persisted/synced
+		# again afterwards.
+		if remembered_ambient is not None:
+			self.doubleSpinBox_pot_temp.setValue(remembered_ambient)
 		self.btn_pot_reset.clicked.connect(self.on_action_pot_reset)
 		# Only meaningful (and only shown) once the server confirms its Pot
 		# is simulated - see on_system_changed()'s "PlantSim" handling.
 		self.btn_pot_reset.setVisible(False)
+		self.label_pot_temp.setVisible(False)
+		self.doubleSpinBox_pot_temp.setVisible(False)
 
 		self.send_data = Queue()
 		self.slider_pwr_initial_update = True
@@ -509,6 +518,8 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 			# showing whatever the user last set rather than blanking it.
 			self.ambient_temp = None
 			self.btn_pot_reset.setVisible(False)
+			self.label_pot_temp.setVisible(False)
+			self.doubleSpinBox_pot_temp.setVisible(False)
 			self.warp_factor = 1.0
 			self.sud_elapsed_seconds = None
 			self.sud_name = ''
@@ -554,10 +565,12 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 				self.warp_factor = msg['WarpFactor']
 			elif "PlantSim" in key:
 				self.btn_pot_reset.setVisible(msg['PlantSim'])
+				self.label_pot_temp.setVisible(msg['PlantSim'])
+				self.doubleSpinBox_pot_temp.setVisible(msg['PlantSim'])
 		self.update_status_env_label()
 
 	def on_action_pot_reset(self):
-		self.msg_pot.send({'Reset': True})
+		self.msg_pot.send({'Reset': self.doubleSpinBox_pot_temp.value()})
 
 	def on_ambient_entry_changed(self, value):
 		# Persisted on shutdown instead (see closeEvent()), not on every

client/main_window.py

@@ -1247,6 +1247,17 @@ class Ui_MainWindow(object):
         self.btn_pot_reset = QtWidgets.QPushButton(self.centralwidget)
         self.btn_pot_reset.setGeometry(QtCore.QRect(700, 500, 220, 31))
         self.btn_pot_reset.setObjectName("btn_pot_reset")
+        self.label_pot_temp = QtWidgets.QLabel(self.centralwidget)
+        self.label_pot_temp.setGeometry(QtCore.QRect(930, 500, 91, 31))
+        self.label_pot_temp.setAlignment(QtCore.Qt.AlignCenter)
+        self.label_pot_temp.setObjectName("label_pot_temp")
+        self.doubleSpinBox_pot_temp = QtWidgets.QDoubleSpinBox(self.centralwidget)
+        self.doubleSpinBox_pot_temp.setGeometry(QtCore.QRect(1030, 500, 70, 31))
+        self.doubleSpinBox_pot_temp.setDecimals(0)
+        self.doubleSpinBox_pot_temp.setMinimum(-999.0)
+        self.doubleSpinBox_pot_temp.setMaximum(999.0)
+        self.doubleSpinBox_pot_temp.setSingleStep(1.0)
+        self.doubleSpinBox_pot_temp.setObjectName("doubleSpinBox_pot_temp")
         self.label_8 = QtWidgets.QLabel(self.centralwidget)
         self.label_8.setGeometry(QtCore.QRect(200, 500, 67, 31))
         self.label_8.setAlignment(QtCore.Qt.AlignCenter)
@@ -1321,6 +1332,8 @@ class Ui_MainWindow(object):
         self.doubleSpinBox_ambient.setToolTip(_translate("MainWindow", "Set the simulated/assumed ambient temperature"))
         self.btn_pot_reset.setToolTip(_translate("MainWindow", "Only available when the server\'s Pot is simulated"))
         self.btn_pot_reset.setText(_translate("MainWindow", "Pot reset to ambient temperature"))
+        self.label_pot_temp.setText(_translate("MainWindow", "Pot [°C]"))
+        self.doubleSpinBox_pot_temp.setToolTip(_translate("MainWindow", "Pre-dial the temperature btn_pot_reset applies to the simulated Pot"))
         self.label_8.setText(_translate("MainWindow", "Host"))
         self.menu_File.setTitle(_translate("MainWindow", "&File"))
         self.menu_Help.setTitle(_translate("MainWindow", "&Help"))