* Fix: Prevent fatal error when too few arguments passed to widget_title filter. PR#4302
* Dev: Update subscriptions-core to 1.6.2. PR#4302

* Fix-Jquery deprecated code.
* Tweak-Jquery 3.0 compatibility.
* Tweak-Improve performance of scheduled action that completes orders after product is released.
* Fix-Use WooCommerce order details template instead of a custom one.
* Fix-“Your previous cart was emptied” message does not show when using ajax cart.
* Fix-Error message on Pre-Orders list when a product pre-order is disabled.
* Fix-Broken email links when sending links via WooCommerce > Pre-Orders > Actions.
* Tweak-Pre-Orders table under My Account > Pre Orders responsiveness
* Fix-Stock inventory is not replenished when a pre-order that’s set to charge “Upon Release” is canceled.
* Tweak-Pre-load product when clicking on “Use the actions menu” to change the release date.
* Add-Allow to search for Pre orders only and Regular orders only on WooCommerce > Orders.
* Fix-Refunded orders are counted as Net Sales in WC > Reports when Pre-Orders is active.
* Tweak-Prevent listing pre-orders when they must be paid upfront and the payment fails.
* Tweak-Rename the .pot file so it matches the registered text domain.
* Add-Add fees to order when creating via admin.
* Fix-Reduce inventory for 100% coupon payments.
* Fix-Complete the product’s release process when the release date is updated to the past and pre-orders exist.
* Tweak-Make the notice for when the cart contains a pre-order be of the ‘error’ type.
* Add-Add an option to enable product Pre-Order automatically when stock hits zero.
* Fix-Email message when order is on-hold.
* Tweak-Prevent multiple pre-order products to be added on order created via admin.
* Fix-“Release Date Changed” email mentions it changed to a future date when it’s set to the past.
* Tweak-Pre-Orders status counter performance improvement

* Tweak: Register ProductTour as a separate block-editor plugin-#714
* Tweak: Update product tour opening logic-#719
* Sensei LMS: Version bump to 3.15.0 https://raw.githubusercontent.com/Automattic/sensei/version/3.15.0/changelog.txt

* New: Update the minimum required WooCommerce version from 3.9 to 4.4. PR#4282
* Fix: Unable to remove subscription line items via the REST API. PR#4258
* Fix: Don’t show subscription related product fields when the custom variable type products are created. PR#4215
* Fix: Add consistent margins to the recurring taxes totals row on the Checkout and Cart block. PR#4273
* Fix: Fatal error due to order with no created date in order row template. PR#4273
* Fix: Fatal error on the customer payment page for renewal orders with deleted products. PR#4273
* Fix: Prevent fatal errors on the admin subscriptions screen when a subscription fails to load. PR#4290
* Fix: Incorrect message on the subscriptions table when filtering returns no results. PR#4290
* Fix: Update Cart and Checkout Block hooks to prevent deprecation warnings. PR#4280
* Tweak: Update tooltip wording when deleting product variation. PR#4273
* Tweak: Don’t show an admin error notice when a store downgrades to a previous minor version of Subscriptions. PR#4273
* Tweak: Misleading order note on payment method change. PR#4273
* Dev: Moved subscription core files moved into a new subscriptions-core library (loaded from vendor/woocommerce/subscriptions-core). PR#4121
* Dev: New `WC_Subscriptions_Plugin` class to be the main Subscriptions plugin handler class. PR#4116
* Dev: Moved and deprecated 33 functions from class `WC_Subscriptions` to more suitable classes. PR#4114
* Dev: Moved switching feature related classes into its own directory (`includes/switching/`). PR#4122
* Dev: Moved payment retry feature related classes into its own directory (`includes/payment-retry/`). PR#4146
* Dev: Moved early renewal feature related classes into its own directory (`includes/early-renewals/`). PR#4148
* Dev: Moved the “Accept manual renewals” feature and settings to a new `WCS_Manual_Renewal_Manager` class. PR#4124
* Dev: Moved the “Customer Suspensions” feature and settings code to a new `WCS_Customer_Suspension_Manager` class. PR#4138
* Dev: Moved the “Drip Downloadable Content” feature and settings to a new `WCS_Drip_Downloads_Manager` class. PR#4142
* Dev: Moved the “Allow $0 initial checkout without a payment method” feature and settings to a new `WCS_Zero_Initial_Payment_Checkout_Manager` class. PR#4145
* Dev: Moved the “Limited payment recurring coupon” feature to a new `WCS_Limited_Recurring_Coupon_Manager` class. PR#4150
* Dev: Moved the custom subscription product and checkout button text feature to a new `WCS_Call_To_Action_Button_Text_Manager` class. PR#4152
* Dev: Moved the custom active and inactive subscriber roles feature to a new `WCS_Subscriber_Role_Manager` class. PR#4153
* Dev: Removed the Action Scheduler library from WC Subscriptions since it has been included in WooCommerce core since version 3.0. PR#4202