Template Module Positions Not Displaying All Positions

[philowantage]

Steps to reproduce the issue

Under the Template: Options there is a selection for Preview Module Positions. When this is Enabled and the URL of the site is appended with ?tp=1, all positions should be displayed even if there are no modules loaded into them.

Expected result

All positions should be displayed.

Actual result

Casiopeia has 16 positions, but only 5 are displayed when no modules are loaded on the page. i.e. topbar, below-top, breadcrumbs, main-top, main-bottom and debug.

System information (as much as possible)

Under normal operation templates use the countModules() function to decide if a module position should be displayed.

Additional comments

There is no point in the Position Preview if you can't see everything. i.e. All 16 positions in Casiopeia.

[brianteeman]

For reference the pull request that should make this work was #29521

[brianteeman]

The PR that broke the behaviour was #35225 and specifically in this code.

joomla-cms/libraries/src/Helper/ModuleHelper.php

Lines 169 to 174 in 79ac1e1

	// Return early if only the content is required
	if (!empty($attribs['contentOnly']))
	{
	return $module->content;
	}

Sorry I dont understand it enough to fix it.

[chmst]

See also #34743 tests are welcome!

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/36071.}

[brianteeman]

#34743 is completely unrelated and I just confirmed that when testing #34743 the issue reported here is still present

[Fedik]

Pleas test #36268