Filtering hierarchical tags

[eternel at seznam.cz]

Hi,

I would like to ask about tags and their filtering functionality. In the 
digikam database I have some photos tagged in and exported from darktable. 
The tags in darktable are hierarchical like 'places|country|city'. Only the 
last tag is given explicitly, the higher levels are given implicitly. In 
digikam, when looking at the properties tab, the tag seems to be read 
correctly as 'places / country / city'. But when inspecting tags in the 
captions tab, only the 'city' tag is set. (The hierarchy is respected 
though.) Hence, If I filter the images for the 'city', everything works as 
expected. However, if I try to filter fo the 'country', no images are 
included. Only if the country is explicitly given as 'places|country' 
(without the 'city') together with 'places|country|city'. Is this 
intentional? Is it possible to change the behaviour? It seems natural to me 
that all parts of the hierarchical tag define the image. Moreover, when 
inspecting the image exported from darktable with exiftool, even the 
'country' tag is included in the 'Subject' field even when using only the 
tag 'places|country|city'.

Thanks in advance!

I tested on digikam 8.1 on linux, release notes of 8.2 does not seem to 
mention this.
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