Added preambles option to fromShapes to prevent Path.Area from emmitting a preamble before every block of movement.

src/Mod/Path/App/Area.cpp

@@ -2940,19 +2940,21 @@ void Area::toPath(Toolpath &path, const std::list<TopoDS_Shape> &shapes,
             PARAM_REF(PARAM_FARG,AREA_PARAMS_ARC_PLANE),
             PARAM_FIELDS(PARAM_FARG,AREA_PARAMS_SORT));
 
-    // absolute mode
-    addGCode(path,"G90");
-    if(abs_center)
-        addGCode(path,"G90.1"); // absolute center for arc move
-
     short currentArcPlane = arc_plane;
-    if(arc_plane==ArcPlaneZX)
-        addGCode(path,"G18");
-    else if(arc_plane==ArcPlaneYZ)
-        addGCode(path,"G19");
-    else {
-        currentArcPlane=ArcPlaneXY;
-        addGCode(path,"G17");
+    if (preamble) {
+      // absolute mode
+      addGCode(path,"G90");
+      if(abs_center)
+          addGCode(path,"G90.1"); // absolute center for arc move
+
+      if(arc_plane==ArcPlaneZX)
+          addGCode(path,"G18");
+      else if(arc_plane==ArcPlaneYZ)
+          addGCode(path,"G19");
+      else {
+          currentArcPlane=ArcPlaneXY;
+          addGCode(path,"G17");
+      }
     }
 
     AxisGetter getter;

src/Mod/Path/App/AreaParams.h

@@ -234,6 +234,7 @@
     ((double,feedrate_v,FeedRateVertical,0.0, "Vertical only (step down) move feed rate", App::PropertyFloat)) \
     ((bool,verbose,Verbose,true, "If true, each motion GCode will contain full coordinate and feedrate")) \
     ((bool,abs_center,AbsoluteArcCenter,false, "Use absolute arc center mode (G90.1)")) \
+    ((bool,preamble,EmitPreamble,true,"Emit preambles")) \
     AREA_PARAMS_DEFLECTION
 
 /** Group of all Area configuration parameters except CArea's*/

src/Mod/Path/PathScripts/PathAreaOp.py

@@ -215,6 +215,8 @@ class ObjectOp(PathOp.ObjectOp):
         pathParams['resume_height'] = obj.StepDown.Value
         pathParams['retraction'] = obj.ClearanceHeight.Value
         pathParams['return_end'] = True
+        # Note that emmitting preambles between moves breaks some dressups and prevents path optimization on some controllers
+        pathParams['preamble'] = False
 
         if self.endVector is not None:
             pathParams['start'] = self.endVector