Enable the touchscreen option, and get a stack of an item in your inventory. When you try to drag the stack the number will go to the upper-right corner of the item as shown in the attached picture.
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In that case the finger would still partially cover the number more or less depending on the placement of the finger.
Ever thought about that this may be clearly intended ?
When the number would be rendered at the bottom of the item, the number would be covered by the finger.
In the current implementation the number stays readable.
(Assuming, since I don't own a touchscreen capable device)