Too small line height in CSS for headings

Hi,

h1 and other h elements have to small line-height. When the heading is
long and the page is not wide enough, the heading is split into two
lines, then you can see that heading lines overlaps.

The line-height reported by Firefox and Chromium is 19px which is at
the beginning of of doxygen.css:

body, table, div, p, dl {
	font: 400 14px/19px Roboto,sans-serif;
}

Sorry for not proving a patch but my CSS knowledge is very limited.

Using Doxygen 1.8.3.1-20130209.

Vaclav

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