[wp-meta] [Making WordPress.org] #7345: Add "Compatible up to" plugin header

[Making WordPress.org]

#7345: Add "Compatible up to" plugin header
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 Reporter:  azaozz            |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:
Component:  Plugin Directory  |   Keywords:
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 This idea has been floating around for a while. It would be really helpful
 for plugins to be able to set a maximum supported WP version in addition
 to the minimum/required version. That would allow the plugins to ensure
 they are being updated on time and will not cause errors in future
 versions of WordPress.

 Thinking that an optional `Compatible up to` header in the plugin's file
 (same as `Requires at least` and `Requires PHP`) would serve that purpose
 well. Then in core that header can be checked and the plugin not loaded if
 WordPress is newer, similarly to how the `Requires PHP` check works.

 On the plugins directory side the `Compatible up to` header may eventually
 be used to sent a warning message when installing plugins through wp-
 admin. Perhaps like "This plugin is too old and is not compatible with
 your version of WordPress" instead of the "This plugin has not been tested
 with your version of WordPress" when the header is present.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/7345>
Making WordPress.org <https://meta.trac.wordpress.org/>
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