Fix #115887: Fallback tool only tweaks single elements

Use the same pass-through option when the select tool is used as a
fallback.

scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -565,18 +565,18 @@ def _template_items_tool_select(
         cursor_prioritize=False,
         fallback=False,
 ):
-    if not params.legacy and not fallback:
+    select_passthrough = False
+    if not params.legacy:
         # Experimental support for LMB interaction for the tweak tool. see: #96544.
         # NOTE: For RMB-select this is a much bigger change as it disables 3D cursor placement on LMB.
         # For LMB-select this means an LMB -drag will not first de-select all (similar to node/graph editor).
-        select_passthrough = False
         if params.select_mouse == 'LEFTMOUSE':
             select_passthrough = params.use_tweak_select_passthrough
         else:
             if not cursor_prioritize:
                 select_passthrough = True
 
-        if select_passthrough:
+        if not fallback and select_passthrough:
             return [
                 (operator, {"type": 'LEFTMOUSE', "value": 'PRESS'},
                  {"properties": [("deselect_all", True), ("select_passthrough", True)]}),
@@ -592,7 +592,11 @@ def _template_items_tool_select(
         # unless it is expected that the tool should operate on the selection (click-drag to rip for e.g.).
         return [
             (operator, {"type": 'LEFTMOUSE', "value": 'PRESS'},
-             {"properties": [("deselect_all", True)]}),
+             {"properties": [
+                 ("deselect_all", True),
+                 # Without this, fallback tool doesn't support pass-through, see: #115887.
+                 *((("select_passthrough", True),) if select_passthrough else ()),
+             ]}),
             (operator, {"type": 'LEFTMOUSE', "value": 'PRESS', "shift": True},
              {"properties": [("toggle", True)]}),