[6.1] Echo result of onAfterDisplay event

[janschoenherr]

Summary of Changes

Currently it's not possible to manipulate the result within the onAfterDisplay event of the HtmlView class.
The event was introduced here: e8dfbb4

This change makes it possible to change the output of a template script and have the changed output cached with Joomla's progressive caching enabled.

Testing Instructions

No test instructions. No views should be affected.

Actual result BEFORE applying this Pull Request

This change should not cause any change in Joomla's behavior.

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[rdeutz]

Conflict with #46770 as far as I see it.

[janschoenherr]

I will rebase the commit once the other PR is accepted.

[janschoenherr]

It's resolved now 👍

[chaitali-tekdi]

I have tested this item ✅ successfully on 26d40d0

I tested this issue, and it was tested successfully.

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46771.}

[komalm]

I have tested this item ✅ successfully on d22b0ac

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46771.}

[Denitz]

Please note that it was rejected 3 years ago: #41506
To be honest, it's a 101% required PR and it should be merged.

[janschoenherr]

@Denitz Thanks, we could also reopen your PR. The import thing to note is that there is no way to modify the output and store that modification in the cache.

[Denitz]

No need to open my PR, let's use yours - the fresh one.

[Denitz]

I have tested this item ✅ successfully on 089fb6a

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46771.}