add way to make subsurfaces from surfaces #975

	name: Continuous Integration

	on:
	push:
	branches:
	- master
	pull_request:

	jobs:
	ci:
	strategy:
	fail-fast: false
	matrix:
	rust: ['1.65.0', 'stable', 'beta']
	runs-on: ubuntu-latest

	steps:
	- name: Checkout sources
	uses: actions/checkout@v2

	- name: Cargo cache
	uses: actions/cache@v1
	with:
	path: ~/.cargo
	key: cargo-${{ matrix.rust }}

	- name: Rust toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: ${{ matrix.rust }}
	override: true

	- name: Install system dependencies
	run: sudo apt-get install libxkbcommon-dev libwayland-dev

	- name: Test lib no features
	uses: actions-rs/cargo@v1
	with:
	command: test
	args: --no-default-features --lib

	- name: Test doc no features
	uses: actions-rs/cargo@v1
	with:
	command: test
	args: --no-default-features --doc

	- name: Test full features
	uses: actions-rs/cargo@v1
	with:
	command: test
	args: --all-features

	lint:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout sources
	uses: actions/checkout@v2

	- name: Rust toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	override: true
	components: rustfmt, clippy

	- name: Cargo fmt
	run: cargo fmt --all -- --check

	- name: Install system dependencies
	run: sudo apt-get install libxkbcommon-dev

	- name: Clippy
	run: cargo clippy -- -D warnings

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