Upgrade for WP 4.9 and remove back-compat for <4.7

[westonruter]

• [x] Conditionally incorporate https://github.com/xwp/wp-customize-snapshots/pull/161 when on 4.9+.
• [x] Make sure features not merged into core are ported into customize-snapshots.js, including changeset title and saving the current previewed URL and expanded panels/sections as meta when saving a changeset, etc.
• [x] Fix autosave requests. They currently fail with a changeset_post_save_failure for edit_others_posts. There is some conflict between setting the caps in \CustomizeSnapshots\Post_Type::extend_changeset_post_type_object() and the logic to in \WP_Customize_Manager::grant_edit_post_capability_for_changeset() when performing an autosave request.
• [x] Update changeset title when user sitting on customizer and schedule time arrived.
• [ ] Test and fix how pending state is saved when user does not have publish capability.

Testing:

• [x] Test if able to publish changeset from front end in compat and 4.9
• [x] Test if able to merge changesets in compat and 4.9
• [x] Test if snapshot admin post edit screen is working as expected in compat and 4.9
• [x] Test state query vars are saved properly in compat and 4.9
• [x] Test if able to create multiple changesets in compat and 4.9
• [x] Overall testing

[coveralls]

Coverage increased (+5.4%) to 80.279% when pulling 922a1ad77835355ebe8c04583bbf0539451e2d8f on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.4%) to 80.279% when pulling 081e066640ef680234e17c4267bbadeea54c51f6 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.357% when pulling 3993bffb01bae9c2ac202270ac67fe3227448290 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.357% when pulling 3993bffb01bae9c2ac202270ac67fe3227448290 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.377% when pulling 54059d282943a1fa490ffbf1bbbe2d6a20b98ed9 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.377% when pulling 0b5ef52b7ef856f1f7285d2e07b75fdf8234e34f on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.377% when pulling 86722c8f3b9ba519ab89df7f02de54150c1bd63d on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.5%) to 80.377% when pulling d471abf2501fbd017b5cfa1e75187250ca7e9209 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-6.3%) to 68.541% when pulling 801dc314d56d1522557bb778eb0c59f6f8cdff64 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-6.3%) to 68.541% when pulling 0ae13883aa1bdcbb904ee537f4676d677d92055f on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-6.3%) to 68.615% when pulling 25a8bd5aeeecb67f312c1a8caebf5ad4809a7aeb on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-5.6%) to 69.291% when pulling b6fa479c9333f5dab1d3bf10b3ebeeec1ed4437d on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-6.2%) to 68.66% when pulling c027e602a82c80f2ce1531cd1114805d5e5b4453 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-6.3%) to 68.56% when pulling 3628a9a1409354121c64d90195344f2486fca09e on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-2.2%) to 72.696% when pulling 5ca224778c423f2c01e9c0ba3ef6ddb86d7c22bc on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[westonruter]

@sayedtaqui the autosave problem actually seems to be super easy to fix. See 71e4bc1.

[coveralls]

Coverage decreased (-2.1%) to 72.789% when pulling 71e4bc1fb85d1a6a2dde79a4c5f4feaa8edfa51d on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-2.1%) to 72.789% when pulling 010b7117b27c9a5cacbbdc8cf83bf4d0af550942 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-2.1%) to 72.789% when pulling 3e2398b5c0210da37a04236df07581cf5d4834fa on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-4.7%) to 70.178% when pulling 745319dbaf016a05a17e04ab1512f3b918f0d08f on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-4.7%) to 70.178% when pulling 4ac46f833e6976b8b01193cf495b4c9b9ac2aabe on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage decreased (-2.1%) to 72.789% when pulling 50f653e8fe53d0691c8fbcd82d347572c1655ce1 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+4.4%) to 79.297% when pulling fce0bb5e54c7f94573d4618bb90430d98601f17d on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+4.4%) to 79.297% when pulling 9b390eb498f6d929d3964c7a060dadd91b90b89e on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+6.0%) to 80.859% when pulling 85385768c5dfbcb4aa4a9c79c447f452fc85c14c on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+6.0%) to 80.859% when pulling 2ca7bac5c156748dc197f20ec466fba2379644e1 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+6.0%) to 80.859% when pulling 868b6b5986a41594663d9fd5540ece37b58085fa on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+6.0%) to 80.859% when pulling 18514d528155bf797e3475ec66985c54a96f1edb on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+6.007%) to 80.892% when pulling 558ef8f8c0e0f12b100453ac48888f8e3e8a61f8 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling 558ef8f8c0e0f12b100453ac48888f8e3e8a61f8 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling 96b247e9f03ec4fee10deff499d3ec748cead2f8 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[westonruter]

@sayedtaqui anything left here as far as you know?

[mohdsayed]

I think this is it. I will do more testing before you wake up.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling 026839a56e3004cb6cf8c8cd9c3b05d412526b63 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling 026839a56e3004cb6cf8c8cd9c3b05d412526b63 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling da511c4b074bd22588d53c25f1be1b60c03b59c0 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling da511c4b074bd22588d53c25f1be1b60c03b59c0 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling da511c4b074bd22588d53c25f1be1b60c03b59c0 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling da511c4b074bd22588d53c25f1be1b60c03b59c0 on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling a2a1ee734f3a24afd915b621cd5de8d34ac9ae2f on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.

[coveralls]

Coverage increased (+5.3%) to 80.211% when pulling 952a754998c2be19bf84c16417e6b861d188769a on upgrade/4.9 into 307604483a2a02f73ab35fb0a2e961be5346e46e on develop.