tp: add tree_propagate_down operator for tree transformations #1617

	# Copyright (C) 2025 The Android Open Source Project
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	# When creating stacked PRs, ensure that PRs are based on main (or another
	# branch) before submitting. This avoid to accidentally merge PR2 onto PR1,
	# if both PR1 and PR2 are opened, which is very confusing when dealing with
	# stacked changes.

	name: Prevent accidental merge PRs into dev branches
	on:
	pull_request:
	types: [opened, synchronize, reopened, edited]
	branches:
	- dev/*/

	jobs:
	pr-branch-check:
	if: startsWith(github.base_ref, 'dev/')
	# Deliberately run on GitHub's ubuntu-latest pool as it's faster for small
	# job like this.
	runs-on: ubuntu-latest
	steps:
	- name: Prevent accidental merge PRs into dev branches
	shell: bash
	run: \|
	echo "❌ You are trying to merge the a PR ${{ github.ref }} on top of another one (${{ github.base_ref }})."
	echo "When working with stacked changes you need to first land the upstream PR, then click on the button that suggests to set main as merge base."
	exit 1

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