Better Formatted Tooltips

As of right now the tooltips are simple one line description of a tool in MyPaint. However for tooltips that are longer than 72 characters such as the compositing layer descriptions, the tooltips begin to look out of place and awkward as shown by one of the contributors in pull request #187 .

@achadwick had an idea on how to format them properly in the same pull request as well.

If we need more gloss than what we have for the operations, it’s possible to use a diagram+title+description tooltip with not much extra coding: similar to what we do for the current tool indicator I think.

The layout can look like:

DIAGRAM   TITLE.TITLE.TITLE     ← in bold
DIAGRAM
DIAGRAM   DESCRIPTION.DESCRIPTION.DESCRIPTION.DESCR
DIAGRAM   IPTION.DESCRIPTION.DESCRIPTION
DIAGRAM
DIAGRAM   SHORTCUT KEY

The image/diagram is approx 48x48 px, and it’ optional.

So what are your guys thoughts? One of MyPaint features is an easy to use Interface, so I think this will help explain more it it’s functions as a user uses MyPaint.