WooCommerce Memberships 1.26.9

* Fix - In some circumstances, product variations not purchasable may have been made purchasable by a membership plan rule for logged in members
* Fix - When restricting only certain variations of products from purchase and not the parent variable product, some variations could still be purchased
* Fix - Address a rare issue where a member user which is also an admin would be logged out when renewing a membership from the frontend while following a renewal link
* Fix - Correctly restrict related product queries in WooCommerce 3.3+
* Fix - Allow iframe HTML elements in user-facing membership messages
* Fix - Allow form and iframe HTML elements in user-facing membership messages
* Fix - Do not link directly to the member area if there are no sections to display
* Fix - Filter the WP_Comment_Query to ensure that the recent comments widget does not show comments from restricted posts
* Dev - Added wc_memberships_message_allowed_html filter hook to extend allowed HTML elements in user messages

* Tweak - Add additional body and post CSS classes when viewing membership content
* Fix - Discounted prices are rounded down to the store currency decimals before they are passed to WooCommerce to avoid rare rounding issues when other plugins or coupons further discount the price
* Fix - Individual variations of variable products that had been restricted from purchase may have been purchased by non-members
* Fix - When restricting a parent category, ensure the same restriction mode is inherited by child categories
* Fix - Address a potential PHP error in the plans edit screen with product variations while using WooCommerce versions older than v3.0
* Dev - Improve compatibility with custom Subscriptions product types
* Dev - Make the Members Area navigation HTML filterable

* Fix - Allow usage of dates in plans and user memberships before 1970
* Fix - Issue where product category widget list could be incorrect if not hiding restricted products
* Fix - When "Hide Completely" is the restriction mode and when two or more plans restrict different bbPress forums, the main topic in a discussion thread may have not been made visible to members
* Fix - If a plan rule sets a discounts for all product categories, the discount may not have applied to variations of variable products
* Fix - Individual variations of variable products manually excluded from restrictions may have not been purchasable by non members
* Dev - Added wc_memberships_user_membership_transferred action hook
* Dev - Added wc_memberships_force_checkout_registration filter hook