coverity#1326120 try and silence Constant expression result

Change-Id: Iafd034dd51135ad99f56279ceee1c770f91436b0

basegfx/source/curve/b2dcubicbezier.cxx

@@ -446,7 +446,7 @@ namespace basegfx
                             : aVecA.getY() / aEdge.getY());
 
                         // relative end point of vector in edge range?
-                        if(fTools::moreOrEqual(fScale, 0.0) && fTools::lessOrEqual(fScale, 1.0))
+                        if (fTools::betweenOrEqualEither(fScale, 0.0, 1.0))
                         {
                             bAIsTrivial = true;
                         }
@@ -468,7 +468,7 @@ namespace basegfx
                             : aVecB.getY() / aEdge.getY());
 
                         // end point of vector in edge range? Caution: controlB is directed AGAINST edge
-                        if(fTools::lessOrEqual(fScale, 0.0) && fTools::moreOrEqual(fScale, -1.0))
+                        if (fTools::betweenOrEqualEither(fScale, -1.0, 0.0))
                         {
                             bBIsTrivial = true;
                         }

basegfx/source/polygon/b2dpolygoncutandtouch.cxx

@@ -229,7 +229,7 @@ namespace basegfx
                         const double fOne(1.0);
                         fCut = (aVecB.getY() * (rCurrB.getX() - rCurrA.getX()) + aVecB.getX() * (rCurrA.getY() - rCurrB.getY())) / fCut;
 
-                        if(fTools::moreOrEqual(fCut, fZero) && fTools::lessOrEqual(fCut, fOne))
+                        if (fTools::betweenOrEqualEither(fCut, fZero, fOne))
                         {
                             // it's a candidate, but also need to test parameter value of cut on line 2
                             double fCut2;
@@ -244,7 +244,7 @@ namespace basegfx
                                 fCut2 = (rCurrA.getY() + (fCut * aVecA.getY()) - rCurrB.getY()) / aVecB.getY();
                             }
 
-                            if(fTools::moreOrEqual(fCut2, fZero) && fTools::lessOrEqual(fCut2, fOne))
+                            if (fTools::betweenOrEqualEither(fCut2, fZero, fOne))
                             {
                                 // cut is in range, add point. Two edges can have only one cut, but
                                 // add a cut point to each list. The lists may be the same for

include/basegfx/numeric/ftools.hxx

@@ -196,6 +196,12 @@ namespace basegfx
         {
             return (rfValA > rfValB || equal(rfValA, rfValB));
         }
+
+        static bool betweenOrEqualEither(const double& rfValA, const double& rfValB, const double& rfValC)
+        {
+            return (rfValA > rfValB && rfValA < rfValC) || equal(rfValA, rfValB) || equal(rfValA, rfValC);
+        }
+
     };
 } // end of namespace basegfx