fix layer order change

src/canvas.cpp

@@ -1295,7 +1295,18 @@ void Canvas::layer_remove(int idx) // m_order index
 }
 void Canvas::layer_order(int idx, int pos) // m_order index
 {
-    std::swap(m_layers[idx], m_layers[pos]);
+    auto from = m_layers.begin() + idx;
+    auto to = m_layers.begin() + pos;
+
+    if (pos < idx)
+        std::rotate(to, from, from + 1);
+    if (pos > idx)
+        std::rotate(from, from + 1, to + 1);
+
+    if (m_current_layer_idx == idx)
+        m_current_layer_idx = pos;
+    else if (m_current_layer_idx == pos)
+        m_current_layer_idx = idx;
 }
 void Canvas::layer_merge(int source_idx, int dest_idx) // m_layer index
 {

src/node_panel_layer.cpp

@@ -146,11 +146,11 @@ void NodePanelLayer::init()
         ActionManager::add(a);
     };
     btn_add->on_click = [this](Node*) {
-        add_layer(true, true);
+        add_layer(true, true, m_layers_container->get_child_index(m_current_layer) + 1);
     };
     btn_remove->on_click = [this](Node*) {
         if (m_layers.size() == 1)
-            return; // dont' delete the last layer
+            return; // don't delete the last layer
         remove_layer(m_current_layer);
     };
     btn_up->on_click = [this](Node*) {
@@ -251,11 +251,11 @@ NodeLayer* NodePanelLayer::add_layer(const char* name, bool add_history /*= true
     return l.get();
 }
 
-void NodePanelLayer::add_layer(bool add_history /*= true*/, bool create_events /*= false*/)
+void NodePanelLayer::add_layer(bool add_history /*= true*/, bool create_events /*= false*/, int index /*= -1*/)
 {
     static char s[64];
     sprintf(s, "Layer-%d", id_counter++);
-    add_layer(s, add_history, create_events);
+    add_layer(s, add_history, create_events, nullptr, nullptr, index);
 }
 
 NodeLayer* NodePanelLayer::get_layer_at(int index)

src/node_panel_layer.h

@@ -63,7 +63,7 @@ public:
     virtual void init() override;
     virtual kEventResult handle_event(Event* e) override;
     void merge(int src_index, int dst_index, bool create_history);
-    void add_layer(bool add_history = true, bool create_events = false);
+    void add_layer(bool add_history = true, bool create_events = false, int index = -1);
     NodeLayer* add_layer(const char* name, bool add_history = true, bool create_events = false,
         std::shared_ptr<Layer> layer = nullptr, std::shared_ptr<NodeLayer> layer_node = nullptr, int index = -1);
     NodeLayer* get_layer_at(int index);