tdf#124272 use ClipRegion's geometry if not a rectangle

By error the ClipRegion's geometry was replaced by it's
BoundRect expanded to PixelBounds. If the ClipRegion
is not a rectangle, this will create wrong results. To
do both - extend to PixelBounds and have the original
geometry included - use the PolyPolygon topology as
needed (see comment in code for details)

Reviewed-on: https://gerrit.libreoffice.org/70146
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>
(cherry picked from commit 362c1cf2)

Conflicts:
	sw/source/core/doc/notxtfrm.cxx

Change-Id: If3f75223144eba8eb23909a7c701ad544346099b
Reviewed-on: https://gerrit.libreoffice.org/70158Tested-by: Xisco Faulí <xiscofauli@libreoffice.org>
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

sw/source/core/doc/notxtfrm.cxx

@@ -1047,9 +1047,34 @@ void paintGraphicUsingPrimitivesHelper(
                     ceil(aClipRange.getMaxX() + aSinglePixelXY.getX()),
                     ceil(aClipRange.getMaxY() + aSinglePixelXY.getY()));
 
+                // create the enclosing rectangle as polygon
+                basegfx::B2DPolyPolygon aTarget(basegfx::utils::createPolygonFromRect(aExpandedClipRange));
+
+                // tdf#124272 the fix above (tdf#114076) was too rough - the
+                // clip region used may be a PolyPolygon. In that case that
+                // PolyPolygon would have to be scaled to mentioned PixelBounds.
+                // Since that is not really possible geometrically (would need
+                // more some 'grow in outside direction' but with unequal grow
+                // values in all directions - just maaany problems
+                // involved), use a graphical trick: The topology of the
+                // PolyPolygon uses the stndard FillRule, so adding the now
+                // guaranteed to be bigger or equal bounding (enclosing)
+                // rectangle twice as polygon will expand the BoundRange, but
+                // not change the geometry visualization at all
+                if(!rOutputDevice.GetClipRegion().IsRectangle())
+                {
+                    // double the outer rectangle range polygon to have it
+                    // included twice
+                    aTarget.append(aTarget.getB2DPolygon(0));
+
+                    // add the original clip 'inside' (due to being smaller
+                    // or equal). That PolyPolygon may have an unknown number
+                    // of polygons (>=1)
+                    aTarget.append(aClip);
+                }
+
                 aContent[0] = new drawinglayer::primitive2d::MaskPrimitive2D(
-                    basegfx::B2DPolyPolygon(
-                        basegfx::utils::createPolygonFromRect(aExpandedClipRange)),
+                    aTarget,
                     aContent);
             }
         }