[context-menu] Fix wrong items vertical margins and left padding.

[fabiocaccamo]

Fix #800

Before

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After

[justvanrossum]

Thanks! While this is indeed better, I find the top and bottom margins a wee bit too much now. I think 0.25em for both is enough.

[fabiocaccamo]

I tried 0.25em, but I think the last item is too close to the bottom:

[justvanrossum]

I tried 0.25em, but I think the last item is too close to the bottom:

How about top 0.2, bottom 0.3?

[fabiocaccamo]

I think 0.5 is better because the last item should have the same margins of an item in the middle.

This is 0.2 top, 0.3 bottom:

[justvanrossum]

I think 0.5 is better because the last item should have the same margins of an item in the middle.

Good point, but that makes me think the space around the dividers is too generous. Can you try to reduce that?