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Some of the changes in XF 2.1.8 include:
Attempt to merge reactions when merging posts
Only hydrate autoIncrement relation fields if there is no value in the parent entity. If the field has a value in the parent, an exception is now thrown.
Use \ZipArchive::OVERWRITE flag when creating add-on zip to maintain compatibility with newer libzip versions
Ensure more consistent sorting is used for class extensions, code event listeners and template modifications.
This is a maintenance release to fix bugs.
Added support for PHP 7.4
Added support for [Emoji 12.0](https://emojipedia.org/emoji-12.0/) and [Emoji 12.1](https://emojipedia.org/emoji-12.1/) emojis
Removed support for Gfycat embeds due to ongoing unaddressed security concerns on their end.
Adjusted advertisement CSS classes to use a dynamic class name.
Added a reset to the "upgrade in progress" flag when the u
IMPORTANT UPGRADE NOTICE
Please note that not all third-party applications and themes are yet compatible with Invision Community 4.5. If you utilize third-party resources, including custom themes, please ensure they have been declared compatible by their respective authors or your site may be non-functional after an upgrade.
The following items have been marked as deprecated in Invision Community 4.5. This means that while they currently work, they will be removed in a future version and