[Qgis-user] Altered behavior of Value Relation widget from QGIS ver. 3.38 to 3.40

[Bo Victor Thomsen]

Hi list -

In QGIS ver. 3.38 and prior versions - using a "Value Relation" widget 
in a attribute form - you could change the behavior of the drop-down 
value list in the widget by checking/unchecking the "Allow NULL value" 
checkbox:

  * If "Allow NULL value" was checked, the chosen value  would be
    "blank"/not chosen.
  * If "Allow NULL value" was /not /checked, the chosen value would be
    set to the first value in the value list.

So you could decide if the field automatically got a value from the 
drop-down list without any manual user action.

/However,/ in QGIS version 3.40 and onward, this behavior has changed. 
Regardless of the state of the "Allow NULL value" checkbox the initial 
value of the widget is always "blank"/not chosen.

Is this the new expected behavior or is it a regression bug ? And if it 
is the expected behavior: Can you somehow enable the old behavior ??

I have many (many, many...) QGIS projects depending on the old behavior.

  --

Med venlig hilsen / Best regards

Bo Victor Thomsen
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