The first set of images show the padding (or lack thereof) in the current master for the notification widget.
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The second set of images show the change when padding (margins) is added to the left and top of the notification icon. Unfortunately, this shifts certain notification titles (third image, Moving: Finished) too far up and above the icon image, and out of alignment. There is also a problem with the icon image not having proper bottom margins (first image, Crystal - Live).
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The third set of images show the change that lowers the title so as to remedy the problem of having the title jutting/projecting out above the icon. The icon still doesn't have a proper bottom margin and now the notification description (scrollable area) doesn't have much of a margin at all.
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The fourth set of images show all the improvements so far. The icon and the notification description have a margin now and buttons are rendered properly (third image in the set, Moving: Finished).
{F6525756}Before:
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After:
EDIT: The fifth set of images show the improvements seen in the fourth set, with margins added to the right of the layout (the close and Open...{F6533140}
(More padding, buttons)
{F6525786}and margins as even as can be)