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When an area is selected with a blank blueprint while holding SHIFT to suppress display of the editing window, during the on_player_setup_blueprint event LuaPlayer::blueprint_to_setup is an invalid ItemStack.

The on_player_configured_blueprint event is also never fired, in sum giving mods no opportunity to adjust the contents of a blueprint created in this way.

Selecting without holding SHIFT works as expected.

Steps to repro:
1) setup script handler:
2) Drag-select entities with an empty blueprint while holding SHIFT.
3) Script displays "false", expected "true," with the ItemStack holding the blueprinted entities.

Thanks for the report however that's working as intended. There is no "setup" that happens when you hold shift - holding shift bypasses that system completely (as it's intended to do). In that case the blueprint you want is in the players cursor.

Got it, and confirmed that when holding SHIFT, game.players[event.player_index].cursor_stack.get_blueprint_entities() is accessible.

Perhaps a documentation update is in order? When SHIFT is not held, on_player_setup_blueprint is raised before the blueprint in the cursor is actually setup, but during alt-select it's raised after the cursor's blueprint is setup. It's a little confusing.