I have tested this item ✅ successfully on 9b54861

Tricky! I added a Joomla 3 style tmpl structure to com_contacts and added this to the default xml files for both cases:

  	<field
  	name="test"
  	type="text"
  	label="Test in J4 style"
  	default="test"
  	/>

With J3 or J4 as appropriate.
Without the patch the field appeared with the J3 label in the Details tab immediately beneath the Menu Item Type field.
With the patch the field appeared with the J4 label in the Details tab immediately beneath the Menu Item Type field. QED!

@Denitz do you have then some views in /tmpl and some in /views/$view/tmpl in the same installation package?

@laoneo Yes, I have a component which is expected to work on both J3 and J4.

Hence, it has J3-style /views/xxx/tmpl/xxx.[xml|php] and J4-style /tmpl/xxx/xxx.[xml|php] layouts.

J3 loads as usual via /views/xxx/tmpl/xxx.[xml|php] but J4 should prioritize its new /tmpl/xxx/xxx.[xml|php].

It's the usual task: we already separated the J4 code in /src, only layouts are left. The HtmlView in J4 already prioritises /tmpl/$viewName as the primary template folder. This patch is just the final step.

Ok, I'm using the same layout files for both versions in DPCalendar but it is legit to have different layout files per Joomla major.

@HLeithner Please check again, Allon has accepted this. Sorry for being so impatient, just want to see this PR merged in the nightly build to continue working on J4-specific layouts.

Needs a second test

I have tested this item ✅ successfully on 9b54861

RTC

Thanks