The value -1 is used to indicate no stencil buffer, so we have to check
for sizes <= 0 when deciding whether or not to triangulate the path in
QOpenGL2PaintEngineExPrivate::fill().
This fixes an issue where filling a path would end up filling the whole
outline of the path, which was very visible with fonts over a certain
size (when we go from using the glyph cache to drawing filled paths
for each glyph).
Change-Id: Iafa96124481936db1e5109bba6166a6038c7ca83
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
aeefa4897f