Copy and paste -> Disabled paste of volumes when nothing is selected and fixed enabling/disabling of paste item in toolbar and edit menu

src/slic3r/GUI/Plater.cpp

@@ -3711,10 +3711,12 @@ void Plater::paste_from_clipboard()
 {
     p->view3D->get_canvas3d()->get_selection().paste_from_clipboard();
 }
-
+bool Plater::can_paste_from_clipboard() const
-bool Plater::is_selection_clipboard_empty() const
 {
-    return p->view3D->get_canvas3d()->get_selection().is_clipboard_empty();
+    const Selection& selection = p->view3D->get_canvas3d()->get_selection();
+    const Selection::Clipboard& clipboard = selection.get_clipboard();
+    Selection::EMode mode = clipboard.get_mode();
+    return !clipboard.is_empty() && ((mode == Selection::Instance) || selection.is_from_single_instance());
 }
 
 bool Plater::can_delete() const { return p->can_delete(); }
@@ -3726,6 +3728,6 @@ bool Plater::can_split_to_volumes() const { return p->can_split_to_volumes(); }
 bool Plater::can_arrange() const { return p->can_arrange(); }
 bool Plater::can_layers_editing() const { return p->can_layers_editing(); }
 bool Plater::can_copy() const { return !is_selection_empty(); }
-bool Plater::can_paste() const { return !is_selection_clipboard_empty(); }
+bool Plater::can_paste() const { return can_paste_from_clipboard(); }
 
 }}    // namespace Slic3r::GUI

src/slic3r/GUI/Plater.hpp

@@ -184,7 +184,7 @@ public:
 
     void copy_selection_to_clipboard();
     void paste_from_clipboard();
-    bool is_selection_clipboard_empty() const;
+    bool can_paste_from_clipboard() const;
 
     bool can_delete() const;
     bool can_delete_all() const;

src/slic3r/GUI/Selection.cpp

@@ -1067,15 +1067,21 @@ void Selection::paste_from_clipboard()
     if (!m_valid || m_clipboard.is_empty())
         return;
 
-    if ((m_clipboard.get_mode() == Volume) && is_from_single_instance())
+    switch (m_clipboard.get_mode())
+    {
+    case Volume:
+    {
+        if (is_from_single_instance())
             paste_volumes_from_clipboard();
-    else
-        paste_objects_from_clipboard();
-}
 
-bool Selection::is_clipboard_empty()
+        break;
-{
+    }
-    return m_clipboard.is_empty();
+    case Instance:
+    {
+        paste_objects_from_clipboard();
+        break;
+    }
+    }
 }
 
 void Selection::update_valid()

src/slic3r/GUI/Selection.hpp

@@ -138,19 +138,6 @@ public:
     typedef std::set<int> InstanceIdxsList;
     typedef std::map<int, InstanceIdxsList> ObjectIdxsToInstanceIdxsMap;
 
-private:
-    struct Cache
-    {
-        // Cache of GLVolume derived transformation matrices, valid during mouse dragging.
-        VolumesCache volumes_data;
-        // Center of the dragged selection, valid during mouse dragging.
-        Vec3d dragging_center;
-        // Map from indices of ModelObject instances in Model::objects
-        // to a set of indices of ModelVolume instances in ModelObject::instances
-        // Here the index means a position inside the respective std::vector, not ModelID.
-        ObjectIdxsToInstanceIdxsMap content;
-    };
-
     class Clipboard
     {
         Model m_model;
@@ -168,6 +155,19 @@ private:
         void set_mode(Selection::EMode mode) { m_mode = mode; }
     };
 
+private:
+    struct Cache
+    {
+        // Cache of GLVolume derived transformation matrices, valid during mouse dragging.
+        VolumesCache volumes_data;
+        // Center of the dragged selection, valid during mouse dragging.
+        Vec3d dragging_center;
+        // Map from indices of ModelObject instances in Model::objects
+        // to a set of indices of ModelVolume instances in ModelObject::instances
+        // Here the index means a position inside the respective std::vector, not ModelID.
+        ObjectIdxsToInstanceIdxsMap content;
+    };
+
     // Volumes owned by GLCanvas3D.
     GLVolumePtrs* m_volumes;
     // Model, not owned.
@@ -287,7 +287,8 @@ public:
 
     void copy_to_clipboard();
     void paste_from_clipboard();
-    bool is_clipboard_empty();
+
+    const Clipboard& get_clipboard() const { return m_clipboard; }
 
 private:
     void update_valid();