UI: add sequencer preview context menu

This is mostly a place-holder since many items
have not yet been implemented.

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -2869,6 +2869,7 @@ def km_sequencerpreview(params):
          {"properties": [("property", 'SCALE')]}),
         ("sequencer.strip_transform_clear", {"type": 'R', "alt": True, "value": 'PRESS'},
          {"properties": [("property", 'ROTATION')]}),
+        *_template_items_context_menu("SEQUENCER_MT_preview_context_menu", params.context_menu_event),
     ])
 
     return keymap

release/scripts/startup/bl_ui/space_sequencer.py

@@ -1021,6 +1021,27 @@ class SEQUENCER_MT_context_menu(Menu):
         layout.menu("SEQUENCER_MT_strip_lock_mute")
 
 
+class SEQUENCER_MT_preview_context_menu(Menu):
+    bl_label = "Sequencer Preview Context Menu"
+
+    def draw(self, context):
+        layout = self.layout
+
+        layout.operator_context = 'INVOKE_REGION_WIN'
+
+        props = layout.operator("wm.call_panel", text="Rename...")
+        props.name = "TOPBAR_PT_name"
+        props.keep_open = False
+
+        # TODO: support in preview.
+        # layout.operator("sequencer.delete", text="Delete")
+
+        strip = context.active_sequence_strip
+
+        if strip:
+            pass
+
+
 class SequencerButtonsPanel:
     bl_space_type = 'SEQUENCE_EDITOR'
     bl_region_type = 'UI'
@@ -2431,6 +2452,7 @@ classes = (
     SEQUENCER_MT_strip_lock_mute,
     SEQUENCER_MT_color_tag_picker,
     SEQUENCER_MT_context_menu,
+    SEQUENCER_MT_preview_context_menu,
 
     SEQUENCER_PT_color_tag_picker,