Font renderer uses wrong baseline for some words

[Benedikt Straub]

Some words are drawn with a 1 pixel lower baseline, causing the text layout to look irregular. Especially noticeable in campaign messages with long text.

Attached is a screenshot of a tooltip where the baselines of a lowered word and its correctly layouted neighbours are marked in red.

[GunChleoc (gunchleoc)]

That looks like a rounding error.

[Toni Förster (stonerl)]

This happens in the chat window where the text if the message is two pixels higher than the username.

[Toni Förster (stonerl)]

@Gun

./src/graphic/text/rt_render.cc:978:14: warning: implicit conversion increases floating-point precision: 'float' to 'const double' [-Wdouble-promotion]
             scale_(1.0f),
                   ~^~~~

[GunChleoc (gunchleoc)]

Migrated to https://github.com/widelands/widelands/issues/590