Add notes counter

qubesmanager/settings.py

@@ -1736,12 +1736,23 @@ def __init_services_tab__(self):
         self.service_line_edit.setEditText("")
 
     def __init_notes_tab__(self):
+        self.notes.textChanged.connect(self.__notes_changed)
         try:
             self.notes.setPlainText(self.vm.get_notes())
         except qubesadmin.exc.QubesException:
             self.notes.setPlainText("Could not retrieve notes for this qube ")
             self.notes.setEnabled(False)
 
+    def __notes_changed(self):
+        length = len(self.notes.toPlainText().encode())
+        self.notes_count.setText(
+            "{} / 256000".format(length)
+        )
+        self.notes_count.setStyleSheet(
+            "" if bool(length < 256000)
+            else "QLabel#notes_count {color: red}"
+        )
+
     def __apply_notes_tab__(self):
         try:
             if self.notes.isEnabled():

ui/settingsdlg.ui

@@ -2022,6 +2022,16 @@ For user reference only.
              </property>
             </widget>
            </item>
+           <item>
+            <widget class="QLabel" name="notes_count">
+             <property name="text">
+              <string>0 of 256000</string>
+             </property>
+             <property name="alignment">
+              <set>Qt::AlignmentFlag::AlignRight|Qt::AlignmentFlag::AlignTrailing|Qt::AlignmentFlag::AlignVCenter</set>
+             </property>
+            </widget>
+           </item>
           </layout>
          </item>
         </layout>