Images changed on disk do not refresh

[anjefu]

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If you include an image via markdown as !["title"](image.png) or <img src="image.png">, evaluate that cell, and subsequently change the image on disk somehow, the image in the notebook still shows the old version. Halting the kernel and reopening the notebook sometimes works to refresh the image, but it seems unreliable. I would expect that re-evaluating the cell should be sufficient to show the new image.