Increase text-dy for default shop style

[vholten]

On the talk list, Jóhannes Birgir Jensson pointed out these shops, for which the name is not rendered:

http://www.openstreetmap.org/node/2939951075
http://www.openstreetmap.org/node/2125818740

Increasing text-dy by one pixel allows the name to be rendered.
Before and after:
,

See also #762.

[matthijsmelissen]

Thanks, well-caught!

[matkoniecz]

It really should be possible to somehow automate finding this "text-dy is too small" bugs.

[matthijsmelissen]

Maybe test against the tallest possible symbol? Perhaps "ÉÉÉÉÉÉ"?

[pnorman]

Maybe test against the tallest possible symbol? Perhaps "ÉÉÉÉÉÉ"?

Doesn't work, as you can have the icon fall between the tall points on the É. Also, Tibetan is taller.

[matthijsmelissen]

Thanks for pointing that out. Any systematic method?

[pnorman]

Any systematic method?

There might be a sufficiently high Unicode block character, but I don't know it. The block elements (e.g. █, ▌, ▜, etc) don't have one.

The problem is we want it to overlap the transparent pixels, but not the opaque ones, otherwise a bit of trivial math and examining the MSS would tell us.