problem updating lighttable

[LViatour]

@AlicVB

Describe the bug

when creating an HDR in the light table, the HDR is not visible. You have to change the display order to see it in the lighttable

To Reproduce

1. select multiple raw
2. clic to create HDR
3. the thumbnail of the DNG created is not visible in the light table

Expected behavior
Normally the new DNG HDR should appear in front of the raw files selected for HDR

Platform (please complete the following information):
-3.1.0~git1412.d999cc8a7
-Ubuntu 20.04
-open CL yes
-Nvidia drive 440.64
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[Mark-64]

It seems similar to #4889, I will have a look.

[jenshannoschwalm]

I think creating the hdr file just "creates" it. This does not imply to import it ...

[Mark-64]

Just forcing a refresh in thumbtable, for example changing the visualization order or group/ungroup, makes the DNG appear, so definitely the HDR is imported, only the view is not refreshed, like in #4889

[Mark-64]

PR created

[Mark-64]

Fixed, via b26f247, please close