Addon Manager: Add note about Other... deps

src/Mod/AddonManager/addonmanager_devmode_add_content.py

@@ -532,6 +532,9 @@ class EditDependency:
         # Expect mostly Python dependencies...
         self.dialog.typeComboBox.setCurrentIndex(2)
 
+        self.dialog.layout().setSizeConstraint(QLayout.SetFixedSize)
+
+
     def exec(
         self, dep_type="", dep_name="", dep_optional=False
     ) -> Tuple[str, str, bool]:
@@ -618,8 +621,10 @@ class EditDependency:
         selection = self.dialog.dependencyComboBox.currentData()
         if selection == "other":
             self.dialog.lineEdit.show()
+            self.dialog.otherNote.show()
         else:
             self.dialog.lineEdit.hide()
+            self.dialog.otherNote.hide()
 
 
 class EditFreeCADVersions:

src/Mod/AddonManager/developer_mode_edit_dependency.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>347</width>
-    <height>142</height>
+    <height>236</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -43,6 +43,24 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QLabel" name="otherNote">
+       <property name="font">
+        <font>
+         <italic>true</italic>
+        </font>
+       </property>
+       <property name="text">
+        <string>NOTE: If &quot;Other...&quot; is selected, the package is not in the ALLOWED_PYTHON_PACKAGES.txt file, and will not be automatically installed by the Addon Manager. Submit a PR at &lt;a href=https://github.com/FreeCAD/FreeCAD-addons&quot;&gt;https://github.com/FreeCAD/FreeCAD-addons&lt;/a&gt; to request addition of a package.</string>
+       </property>
+       <property name="wordWrap">
+        <bool>true</bool>
+       </property>
+       <property name="openExternalLinks">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item row="2" column="0" colspan="2">