[5.4] onContentPrepare in mod_articles

[chmst]

Pull Request resolves #45809 .
New for #45813 which was closed and removed by mistake. sorry for that.

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

Added event onContentPrepare to mod_articles

Testing Instructions

see #45809
Use a plugin which uses onContentPrepare.

For a test you can use this plugin (AI generated, for this test only). It adds a line "hi there" into articles if there is some text to display.
prtest.zip

When you apply the PR, please check different combinations of display params in mod_articles.

Actual result BEFORE applying this Pull Request

onContentPrepare is not triggered

Expected result AFTER applying this Pull Request

onContentPrepare is triggered if a text exists

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ramalama]

I have tested this item ✅ successfully on 05b1100

Tested with my custom template. Before: No onContentPrepare Event was fired. After: Event was fired and I could sucessfully hook into it.

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[LadySolveig]

I have tested this item ✅ successfully on 05b1100

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/47467.}

[richard67]

RTC

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[muhme]

✅ Final test before merge with JBT

• Installed and enabled 'Content - PR Test' plugin
• Created 'Articles' site modules with 'Trigger Plugin events' enabled
• Missing the to be inserted text
• Applied PR with Patch Tester
  • Text inserted with onContentPrepare
  • If 'Title only' or 'Introtext' is hide still no text is shown
  • If 'Trigger Plugin Events' is disabled, nothing inserted
  • 'Introtext Limit' is still working
  • Seen extended inline help

[muhme]

Thank you very much @chmst for your contribution. Thanks to @ramalama and @LadySolveig for testing.