[j5.1] Excluding Menu entries from Cache not possible about joomla-cms HOT 4 CLOSED

@joomdonation Could that be fixed in a similar way as you did with PR #42871 for the exclude URLs?

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@richard67 To be able to give an understandable explanation, I would have to read the code again. But the short answer is No, this could not be fixed in the similar way with the other PR I did (that PR fixed a bug in System - Page Cache plugin, but there is no bug in that plugin related to this issue)

Basically, the System Cache (cache is set to on - advanced caching under Global Configuration) is not aware of (or not depend on) the settings from System - Page Cache plugin.

What's happening here is that the page is not being cached by System - Page Cache plugin when the menu item is excluded (that's why I said there is no bug earlier). But Joomla has another tier of caching when the page is displayed - handled in display method of DisplayController, independent with System - Page Cache plugin. That's why the cached content is still being displayed for this case.

This might be a won't fix issue. I wonder if you still need to turn on System - Cache when the System - Page Cache is already in used? The whole page is cached already, so look like by enabling both, we have cache on cache.

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This might be a won't fix issue.

We should just kill the cache plugin. It works as intended but not as users expect. Resulting in confusion and complaints

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The caching in the global configuration is a different caching than the page cache plugin. The page cache plugin is a vastly more agressive caching and only usefull for static websites. As Brian wrote, this is working as intended, even though not as expected, and is not a bug.

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