VCL canvas: fix clipping of gradients (related: tdf#115142)

When using the presenter console, the secondary screen has
a small view of the current slide, which is called a "Pane" in sdext.

Clipping for this is done by sd::presenter::PresenterCanvas, which wraps
the full-screen VCL canvas and has a MergeViewState() to intersect
the clip region.

The VCL canvas has a bug in its gradientFill() implemenation where it
overrides the existing clip on the OutputDevice instead of intersecting
it.

This properly fixes the bug that was wrongly and badly attempted
to be fixed by commit 99e373cd4c78084ded349f3e3de7b0504af2dd90.

Change-Id: Id02678c2f134fe7b190866d6a6fff5b2e5e3aaff
(cherry picked from commit 5d710cf7dda27e78f237211fd92418be4dd1c551)
Reviewed-on: https://gerrit.libreoffice.org/50886
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

0 files changed, 0 insertions, 0 deletions