Prototype feature: fill plater with instances of selected object

#fixes #1350

src/slic3r/GUI/Jobs/FillBedJob.hpp

@@ -0,0 +1,46 @@
+#ifndef FILLBEDJOB_HPP
+#define FILLBEDJOB_HPP
+
+#include "ArrangeJob.hpp"
+
+namespace Slic3r { namespace GUI {
+
+class Plater;
+
+class FillBedJob : public Job
+{
+    Plater *m_plater;
+    int     m_object_idx = -1;
+
+    using ArrangePolygon  = arrangement::ArrangePolygon;
+    using ArrangePolygons = arrangement::ArrangePolygons;
+
+    ArrangePolygons m_selected;
+    ArrangePolygons m_unselected;
+
+    Points m_bedpts;
+
+    int m_status_range = 0;
+
+protected:
+
+    void prepare() override;
+
+public:
+    FillBedJob(std::shared_ptr<ProgressIndicator> pri, Plater *plater)
+        : Job{std::move(pri)}, m_plater{plater}
+    {}
+
+    int status_range() const override
+    {
+        return m_status_range;
+    }
+
+    void process() override;
+
+    void finalize() override;
+};
+
+}} // namespace Slic3r::GUI
+
+#endif // FILLBEDJOB_HPP