Fixes

src/chr.cpp

@@ -156,9 +156,14 @@ void chr_editor_t::on_open_collision(wxCommandEvent& event)
         std::string filename = open_dialog.GetPath().ToStdString();
         collision_filename->SetValue(filename);
         model.collision_path = filename;
-        auto bm = load_collision_file(filename);
-        model.collision_bitmaps = std::move(bm.first);
-        model.collision_wx_bitmaps = std::move(bm.second);
+        try
+        {
+            auto bm = load_collision_file(filename);
+            model.collision_bitmaps = std::move(bm.first);
+            model.collision_wx_bitmaps = std::move(bm.second);
+        }
+        catch(...)
+        {}
         Refresh();
         model.modify();
     }

src/convert.cpp

@@ -66,6 +66,8 @@ std::pair<std::vector<bitmap_t>, std::vector<wxBitmap>> load_collision_file(wxSt
         return {};
 
     std::pair<std::vector<bitmap_t>, std::vector<wxBitmap>> ret;
+
+    wxLogNull go_away;
     wxImage base(string);
     if(!base.IsOk())
         return {};

src/grid_box.cpp

@@ -465,3 +465,9 @@ void editor_t::select_all(bool select)
     canvas_box().selector().select_all(select);
     Refresh();
 }
+
+void editor_t::select_invert()
+{
+    canvas_box().selector().select_invert();
+    Refresh();
+}

src/grid_box.hpp

@@ -362,6 +362,7 @@ class editor_t : public wxPanel
 
     virtual tile_copy_t copy(bool cut);
     virtual void select_all(bool select = true);
+    virtual void select_invert();
 };
 
 class base_tab_panel_t : public wxPanel

src/id.hpp

@@ -33,6 +33,8 @@ enum
     ID_LEVEL_GRID,
     ID_SELECT_ALL,
     ID_SELECT_NONE,
+    ID_SELECT_USAGE,
+    ID_SELECT_INVERT,
 };
 
 #endif

src/level.cpp

@@ -1008,3 +1008,21 @@ void level_editor_t::select_all(bool select)
     else
         return editor_t::select_all(select);
 }
+
+void level_editor_t::select_invert()
+{
+    if(level->current_layer == OBJECT_LAYER)
+    {
+        decltype(level->object_selector) new_selector;
+
+        for(unsigned i = 0; i < level->objects.size(); ++i)
+            if(level->object_selector.count(i) == 0)
+                new_selector.insert(i);
+
+        level->object_selector = std::move(new_selector);
+
+        Refresh();
+    }
+    else
+        return editor_t::select_invert();
+}

src/level.hpp

@@ -176,6 +176,7 @@ class level_editor_t : public editor_t
     void on_active(unsigned i);
 
     virtual void select_all(bool select = true) override;
+    virtual void select_invert() override;
 public:
     void model_refresh();
     void load_metatiles();