Keymap: use Shift-Tab to toggle snap in the sequencer

Match the same shortcut for the 3D view & UV editor.

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

@@ -2659,7 +2659,8 @@ def km_sequencer(params):
          {"properties": [("side", 'LEFT')]}),
         ("sequencer.select_side_of_frame", {"type": 'RIGHT_BRACKET', "value": 'PRESS'},
          {"properties": [("side", 'RIGHT')]}),
-
+        ("wm.context_toggle", {"type": 'TAB', "value": 'PRESS', "shift": True},
+         {"properties": [("data_path", 'tool_settings.use_snap_sequencer')]}),
         *_template_items_context_menu("SEQUENCER_MT_context_menu", params.context_menu_event),
     ])
 

source/blender/makesrna/intern/rna_scene.c

@@ -3116,6 +3116,7 @@ static void rna_def_tool_settings(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Use Snapping", "Snap to strip edges or current frame");
   RNA_def_property_ui_icon(prop, ICON_SNAP_OFF, 1);
   RNA_def_property_boolean_default(prop, true);
+  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL); /* Publish message-bus. */
 
   prop = RNA_def_property(srna, "snap_elements", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_bitflag_sdna(prop, NULL, "snap_mode");