Sketcher: Improvement Continuous Creation Mode: Leave Sketch

============================================================

This enables to exit the sketch by clicking the corresponding toolbar icon, even when in creation mode, i.e.
with a drawHandler active.

Requested here:
http://forum.freecadweb.org/viewtopic.php?f=10&t=11051&start=30#p92181

src/Mod/Sketcher/Gui/Command.cpp

@@ -223,6 +223,15 @@ CmdSketcherLeaveSketch::CmdSketcherLeaveSketch()
 
 void CmdSketcherLeaveSketch::activated(int iMsg)
 {
+    Gui::Document *doc = getActiveGuiDocument();
+
+    if (doc) {
+        // checks if a Sketch Viewprovider is in Edit and is in no special mode
+        SketcherGui::ViewProviderSketch* vp = dynamic_cast<SketcherGui::ViewProviderSketch*>(doc->getInEdit());
+        if (vp && vp->getSketchMode() != ViewProviderSketch::STATUS_NONE)
+            vp->purgeHandler();
+    }
+
     openCommand("Sketch changed");
     doCommand(Gui,"Gui.activeDocument().resetEdit()");
     doCommand(Doc,"App.ActiveDocument.recompute()");
@@ -236,7 +245,7 @@ bool CmdSketcherLeaveSketch::isActive(void)
     if (doc) {
         // checks if a Sketch Viewprovider is in Edit and is in no special mode
         SketcherGui::ViewProviderSketch* vp = dynamic_cast<SketcherGui::ViewProviderSketch*>(doc->getInEdit());
-        if (vp && vp->getSketchMode() == ViewProviderSketch::STATUS_NONE)
+        if (vp /*&& vp->getSketchMode() == ViewProviderSketch::STATUS_NONE*/)
             return true;
     }
     return false;