Enable Doppler preview in the 3D editor by default

This makes setting up AudioStreamPlayer3D nodes for Doppler playback
a bit easier.

- Move AudioStreamPlayer3D's Doppler Tracking property outside a group
  since the group only had 1 property, which resulted in unnecessary
  folding in the inspector.
- Put the AudioStreamPlayer3D Playing and Autoplay properties higher up
  in the inspector since these are likely to be modified often.

doc/classes/AudioStreamPlayer3D.xml

@@ -66,7 +66,8 @@
 			The bus on which this audio is playing.
 		</member>
 		<member name="doppler_tracking" type="int" setter="set_doppler_tracking" getter="get_doppler_tracking" enum="AudioStreamPlayer3D.DopplerTracking" default="0">
-			Decides in which step the Doppler effect should be calculated.
+			Decides in which step the [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] should be calculated.
+			[b]Note:[/b] Only effective if the current [Camera]'s [member Camera.doppler_tracking] property is set to a value other than [constant Camera.DOPPLER_TRACKING_DISABLED].
 		</member>
 		<member name="emission_angle_degrees" type="float" setter="set_emission_angle" getter="get_emission_angle" default="45.0">
 			The angle in which the audio reaches cameras undampened.
@@ -135,10 +136,10 @@
 			Disables doppler tracking.
 		</constant>
 		<constant name="DOPPLER_TRACKING_IDLE_STEP" value="1" enum="DopplerTracking">
-			Executes doppler tracking in idle step.
+			Executes doppler tracking in idle step (every rendered frame).
 		</constant>
 		<constant name="DOPPLER_TRACKING_PHYSICS_STEP" value="2" enum="DopplerTracking">
-			Executes doppler tracking in physics step.
+			Executes doppler tracking in physics step (every simulated physics frame).
 		</constant>
 	</constants>
 </class>

doc/classes/Camera.xml

@@ -144,7 +144,8 @@
 			If [code]true[/code], the ancestor [Viewport] is currently using this camera.
 		</member>
 		<member name="doppler_tracking" type="int" setter="set_doppler_tracking" getter="get_doppler_tracking" enum="Camera.DopplerTracking" default="0">
-			If not [constant DOPPLER_TRACKING_DISABLED], this camera will simulate the [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] for objects changed in particular [code]_process[/code] methods. See [enum DopplerTracking] for possible values.
+			If not [constant DOPPLER_TRACKING_DISABLED], this camera will simulate the [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] for objects changed in particular [code]_process[/code] methods. The Doppler effect is only simulated for [AudioStreamPlayer3D] nodes that have [member AudioStreamPlayer3D.doppler_tracking] set to a value other than [constant AudioStreamPlayer3D.DOPPLER_TRACKING_DISABLED].
+			[b]Note:[/b] To toggle the Doppler effect preview in the editor, use the Perspective menu in the top-left corner of the 3D viewport and toggle [b]Enable Doppler[/b].
 		</member>
 		<member name="environment" type="Environment" setter="set_environment" getter="get_environment">
 			The [Environment] to use for this camera.

editor/plugins/spatial_editor_plugin.cpp

@@ -3917,16 +3917,17 @@ SpatialEditorViewport::SpatialEditorViewport(SpatialEditor *p_spatial_editor, Ed
 	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_DISPLAY_NORMAL), true);
 	view_menu->get_popup()->add_separator();
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_environment", TTR("View Environment")), VIEW_ENVIRONMENT);
+	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_ENVIRONMENT), true);
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_gizmos", TTR("View Gizmos")), VIEW_GIZMOS);
+	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_GIZMOS), true);
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_information", TTR("View Information")), VIEW_INFORMATION);
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_fps", TTR("View FPS")), VIEW_FPS);
-	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_ENVIRONMENT), true);
 	view_menu->get_popup()->add_separator();
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_half_resolution", TTR("Half Resolution")), VIEW_HALF_RESOLUTION);
 	view_menu->get_popup()->add_separator();
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_audio_listener", TTR("Audio Listener")), VIEW_AUDIO_LISTENER);
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_audio_doppler", TTR("Enable Doppler")), VIEW_AUDIO_DOPPLER);
-	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_GIZMOS), true);
+	view_menu->get_popup()->set_item_checked(view_menu->get_popup()->get_item_index(VIEW_AUDIO_DOPPLER), true);
 
 	view_menu->get_popup()->add_separator();
 	view_menu->get_popup()->add_check_shortcut(ED_SHORTCUT("spatial_editor/view_cinematic_preview", TTR("Cinematic Preview")), VIEW_CINEMATIC_PREVIEW);