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front end - What governs images resizing in the FrontEnd environment


What is responsible for the middle Row images' size? And why single image row is different?


{#, Row[{#, #}], Row[{#}]} & @ RandomImage[1, {100, 100}]

enter image description here


I know I can prevent that with mapping with Pane but I would like to have more understanding about what happens.


I thought it is related to some styles but I haven't found anything related in Core.nb under ImageGraphics or RowDefault styles.



There are related options like ImageSizeAction or ImageSizeMultipliers but I've failed to find connection with the case.



It doesn't seem predictable, since here overall size is larger yet nothing is resized:


{#, Row[{#, #, #, #, #}], Row[{#}]} &@RandomImage[1, {50, 100}]

enter image description here




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