tdf#96257: Silly work-around to produce same result on OpenGL and non-OpenGL

For likely separate reasons, neither the non-OpenGL nor the OpenGL
code path produces what we actually want here (a line drawn in
'invert' mode if white is used, as happens on X11). In the non-OpenGL
case we get a black line, in the OpenGL case a white one. So let's use
grey and at least get the same effect in both cases.

Change-Id: Ifb587c6b46adb05e334a18add74352663cf7db9e

svx/source/sdr/overlay/overlayselection.cxx

@@ -107,7 +107,16 @@ namespace sdr
                 if(bInvert)
                 {
                     // force color to white for invert to get a full invert
+#ifdef WNT
+                    // tdf#96257: For likely separate reasons, neither the non-OpenGL nor the OpenGL
+                    // code path produces what we actually want here (a line drawn in 'invert' mode
+                    // if white is used, as happens on X11). In the non-OpenGL case we get a black
+                    // line, in the OpenGL case a white one. So let's use grey and at least get the
+                    // same on both.
+                    aRGBColor = basegfx::BColor(0.5, 0.5, 0.5);
+#else
                     aRGBColor = basegfx::BColor(1.0, 1.0, 1.0);
+#endif
                 }
 
                 for(sal_uInt32 a(0);a < nCount; a++)