make compile_templates deterministic

Python3 doesn't keep insertion order for set(), so this sorts some
places for deterministic output for compiled template.

Merge pull request #1449 from amy-lei/loop-scoping

fix loop scoping bug

Merge pull request #1451 from greyli/improve-contributing-guide

Improve the contributing guide

Improve the contributing guide

clear assignments in loops at end of iteration

Merge pull request #1447 from pallets/update-theme

Update theme

update pallets and sphinx requirements

update pallets-sphinx-themes

start version 3.0.2.dev0

Merge pull request #1445 from pallets/release-3.0.1

release version 3.0.1

release version 3.0.1

Merge pull request #1444 from pallets/event-loop

use asyncio.run

use asyncio.run

Merge pull request #1442 from dannysepler/use-pathlib-in-places

Use pathlib in some test places

Use pathlib in some test places

Merge pull request #1440 from pallets/deprecated-markup

fix deprecated `Markup` subclass

fix deprecated `Markup` subclass

Merge pull request #1436 from pallets/deprecated-extensions

fix context for deprecated extensions

show context for deprecated extensions

Merge pull request #1435 from pallets/update-typing

Update typing

fix typing that wasn't available in Python 3.6.0

mark top-level names as exported

Merge pull request #1420 from pallets/default-branch

rename default branch in files

rename default branch in files

Merge pull request #1419 from ThiefMaster/fix-sphinx-build

Install sphinx 4.1-dev from git

Remove type annotation breaking sphinx builds

Install sphinx 4.1-dev from git

Otherwise docs builds are broken due to sphinx-doc/sphinx#9216

Merge pull request #1418 from pallets/update-markupsafe

update markupsafe minimum version

update markupsafe minimum version

start version 3.0.1.dev0

Merge pull request #1417 from pallets/release-3.0.0

Release 3.0.0

release version 3.0.0

update requirements

Merge pull request #1416 from pallets/pre-commit-ci-schedule

update pre-commit monthly

update pre-commit monthly

Merge pull request #1415 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.14.0 → v2.15.0](https://github.com/asottile/pyupgrade/compare/v2.14.0...v2.15.0)
- [github.com/psf/black: 21.4b2 → 21.5b1](https://github.com/psf/black/compare/21.4b2...21.5b1)
- [github.com/PyCQA/flake8: 3.9.1 → 3.9.2](https://github.com/PyCQA/flake8/compare/3.9.1...3.9.2)

Merge pull request #1414 from pallets/typing-marker

fix py.typed in manifest

fix py.typed in manifest

Merge pull request #1412 from pallets/typing

add type annotations

add type annotations

Merge pull request #1411 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.13.0 → v2.14.0](https://github.com/asottile/pyupgrade/compare/v2.13.0...v2.14.0)
- [github.com/psf/black: 21.4b0 → 21.4b2](https://github.com/psf/black/compare/21.4b0...21.4b2)

Merge pull request #1410 from pallets/dependabot/pip/babel-2.9.1

Merge pull request #1409 from pallets/dependabot/pip/pre-commit-2.12.1

Bump babel from 2.9.0 to 2.9.1

Bumps [babel](https://github.com/python-babel/babel) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES)
- [Commits](https://github.com/python-babel/babel/compare/v2.9.0...v2.9.1)

Signed-off-by: dependabot[bot] <support@github.com>

Bump pre-commit from 2.12.0 to 2.12.1

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.12.0 to 2.12.1.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pre-commit/pre-commit/compare/v2.12.0...v2.12.1)

Signed-off-by: dependabot[bot] <support@github.com>

Merge pull request #1408 from pallets/dependabot/add-v2-config-file

Upgrade to GitHub-native Dependabot

Upgrade to GitHub-native Dependabot

Merge pull request #1407 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.12.0 → v2.13.0](https://github.com/asottile/pyupgrade/compare/v2.12.0...v2.13.0)
- [github.com/asottile/reorder_python_imports: v2.4.0 → v2.5.0](https://github.com/asottile/reorder_python_imports/compare/v2.4.0...v2.5.0)
- [github.com/psf/black: 20.8b1 → 21.4b0](https://github.com/psf/black/compare/20.8b1...21.4b0)

Merge pull request #1406 from pallets/release-3.0.0rc2

release version 3.0.0rc2

release version 3.0.0rc2

Merge pull request #1401 from pallets/deprecated-markup

fix deprecated `Markup` subclass

fix Markup subclass

str subclass must override __new__ instead of __init__

Merge pull request #1399 from pallets/release-3.0.0rc1

Release 3.0.0rc1

release version 3.0.0rc1

update minimum install requirements

update deprecated pre-commit hook

update requirements

update pallets-sphinx-themes

mention jinja in deprecation message

Merge pull request #1398 from pallets/docs-filter-anchor

unique links for filters, tests, globals

unique links for filters, tests, globals

Merge pull request #1394 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

[pre-commit.ci] pre-commit autoupdate

Merge pull request #1393 from pallets/deprecate-legacy-resolve

deprecate legacy resolve mode

deprecate legacy resolve mode

Merge pull request #1392 from pallets/inline-async

async support doesn't require patching

async support doesn't require patching

Merge pull request #1391 from pallets/markupsafe-imports

Markup and escape should be imported from markupsafe

Markup and escape should be imported from markupsafe

Merge pull request #1389 from pallets/unify-decorators

unify/rename context function decorators

unify/rename filter and function decorators

Use pass_context instead of contextfilter and contextfunction, etc.

extract common code for import/from nodes

Merge pull request #1152 from angelafrentz/refactor_ternary_statement_compiler

refactor compiler environment.is_async checks

Merge pull request #1387 from pallets/dependabot/pip/urllib3-1.26.4

[Security] Bump urllib3 from 1.26.3 to 1.26.4

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.3 to 1.26.4. **This update includes a security fix.**
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.3...1.26.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #1360 from lisongmin/add-default-value-to-groupby

Ability to set default value in groupby filter

add default parameter to groupby

Merge pull request #1367 from mvolfik/docs-fix

line statements have no default

Fix incorrect docs - line statements have no default

Merge pull request #1364 from Dreamsorcerer/patch-2

Fix map documentation

Fix map documentation

Merge pull request #1236 from sixtyfathoms/fix/issue-1184

Update wording on dictionary default ordering

update wording on dictionary default ordering

Merge pull request #1226 from geographika/patch-1

Add symbol names for tilde and pipe

add symbol names for tilde and pipe operators

Merge pull request #1366 from mvolfik/fix-unicode-newlines

Fix unicode newlines

Split lines in lexer only by \r\n, \r and \n

Python str.splitlines() splits by more characters[1], which, however,
causes problems when keeping these special characters in processed
templates is desirable, i.e. these bug reports: #769, #952, #1313.

The keep_trailing_newlines logic is reworked because splitlines()
removes them already (so they had to be added), while re.split doesn't
so they have to be removed.

[1] https://docs.python.org/3/library/stdtypes.html#str.splitlines

Merge pull request #1363 from remidebette/add-native-async-support

Add async support to NativeEnvironment

NativeEnvironment supports async mode

Merge pull request #1294 from Jafnee/chainableundefined-aiter-bug

Add __aiter__ to Undefined

add Undefined.__aiter__

Merge pull request #1204 from dparker2/undefined-contains

Raise UndefinedError from Undefined.__contains__

Undefined.__contains__ raises UndefinedError

Merge pull request #1171 from amykyta3/feature/base-integer-literals

Add support for hex, octal, and binary integer literals

parse hex, octal, and binary integer literals

Merge pull request #1385 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate