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- Little GUI improvement: Transform pane
You have a drawing and want to set values of a text field in all selected records. So you go to the transform pan, change tab to Expression and type the text in the control for the formula. It's only '12345' - set scope to 'Restrict to Selection' and than 'Update field'.
Bang! You have forgotten to change the default target field in the grey and inconspicious control on top from [geom] to the field you want to change and thus have nulled all geometries of the selected records. No undo.
Yes, the preview was perfect and did show nothing where the objects should be. But 'nothing' isn't so obvious.
 The question is: is there any good reason to set a geom to null in an expression or formula? I really don't know.
Got in the same trouble few times. For me the best would be to have this top field set to nothing, forcing us to set itin order to avoid this user mistake