GUI: finish lock layout

TODO.md

@@ -14,7 +14,6 @@
 - volume commands should work on Game Boy
 - add another FM editor layout
 - try to find out why does VSlider not accept keyboard input
-- finish lock layout
 - if macros have release, note off should release them
 - add ability to select a column by double clicking
 - add ability to move selection by dragging

extern/imgui_patched/imgui.cpp

@@ -3909,6 +3909,8 @@ void ImGui::StartMouseMovingWindowOrNode(ImGuiWindow* window, ImGuiDockNode* nod
         if (root_node->OnlyNodeWithWindows != node || root_node->CentralNode != NULL)   // -V1051 PVS-Studio thinks node should be root_node and is wrong about that.
             if (undock_floating_node || root_node->IsDockSpace())
                 can_undock_node = true;
+        if (node->MergedFlags & ImGuiDockNodeFlags_NoMove)
+            can_undock_node = false;
     }
 
     const bool clicked = IsMouseClicked(0);
@@ -6122,7 +6124,7 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
 
         // Docking: Unhide tab bar (small triangle in the corner), drag from small triangle to quickly undock
         ImGuiDockNode* node = window->DockNode;
-        if (window->DockIsActive && node->IsHiddenTabBar() && !node->IsNoTabBar())
+        if (window->DockIsActive && node->IsHiddenTabBar() && !node->IsNoTabBar() && !(node->MergedFlags & ImGuiDockNodeFlags_NoMove))
         {
             float unhide_sz_draw = ImFloor(g.FontSize * 0.70f);
             float unhide_sz_hit = ImFloor(g.FontSize * 0.55f);

extern/imgui_patched/imgui.h

@@ -1342,7 +1342,8 @@ enum ImGuiDockNodeFlags_
     ImGuiDockNodeFlags_PassthruCentralNode          = 1 << 3,   // Shared       // Enable passthru dockspace: 1) DockSpace() will render a ImGuiCol_WindowBg background covering everything excepted the Central Node when empty. Meaning the host window should probably use SetNextWindowBgAlpha(0.0f) prior to Begin() when using this. 2) When Central Node is empty: let inputs pass-through + won't display a DockingEmptyBg background. See demo for details.
     ImGuiDockNodeFlags_NoSplit                      = 1 << 4,   // Shared/Local // Disable splitting the node into smaller nodes. Useful e.g. when embedding dockspaces into a main root one (the root one may have splitting disabled to reduce confusion). Note: when turned off, existing splits will be preserved.
     ImGuiDockNodeFlags_NoResize                     = 1 << 5,   // Shared/Local // Disable resizing node using the splitter/separators. Useful with programmatically setup dockspaces.
-    ImGuiDockNodeFlags_AutoHideTabBar               = 1 << 6    // Shared/Local // Tab bar will automatically hide when there is a single window in the dock node.
+    ImGuiDockNodeFlags_AutoHideTabBar               = 1 << 6,   // Shared/Local // Tab bar will automatically hide when there is a single window in the dock node.
+    ImGuiDockNodeFlags_NoMove                       = 1 << 7    // Shared/Local // Disable moving node
 };
 
 // Flags for ImGui::BeginDragDropSource(), ImGui::AcceptDragDropPayload()

extern/imgui_patched/imgui_widgets.cpp

@@ -8160,12 +8160,16 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     // Drag and drop a single floating window node moves it
     ImGuiDockNode* node = docked_window ? docked_window->DockNode : NULL;
     const bool single_floating_window_node = node && node->IsFloatingNode() && (node->Windows.Size == 1);
+    bool can_undock = true;
+    if (node) {
+      if (node->MergedFlags & ImGuiDockNodeFlags_NoMove) can_undock = false;
+    }
     if (held && single_floating_window_node && IsMouseDragging(0, 0.0f))
     {
         // Move
         StartMouseMovingWindow(docked_window);
     }
-    else if (held && !tab_appearing && IsMouseDragging(0))
+    else if (held && !tab_appearing && IsMouseDragging(0) && can_undock)
     {
         // Drag and drop: re-order tabs
         int drag_dir = 0;
@@ -8247,7 +8251,7 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
         flags |= ImGuiTabItemFlags_NoCloseWithMiddleMouseButton;
 
     // Render tab label, process close button
-    const ImGuiID close_button_id = p_open ? GetIDWithSeed("#CLOSE", NULL, docked_window ? docked_window->ID : id) : 0;
+    const ImGuiID close_button_id = (p_open && can_undock) ? GetIDWithSeed("#CLOSE", NULL, docked_window ? docked_window->ID : id) : 0;
     bool just_closed;
     bool text_clipped;
     TabItemLabelAndCloseButton(display_draw_list, bb, flags, tab_bar->FramePadding, label, id, close_button_id, tab_contents_visible, &just_closed, &text_clipped);

src/gui/gui.cpp

@@ -3022,8 +3022,8 @@ bool FurnaceGUI::loop() {
       drawPattern();
       drawPiano();
     } else {
-      globalWinFlags=lockLayout?ImGuiWindowFlags_NoMove:0;
-      ImGui::DockSpaceOverViewport(NULL,lockLayout?(ImGuiDockNodeFlags_NoResize|ImGuiDockNodeFlags_NoCloseButton|ImGuiDockNodeFlags_NoDocking|ImGuiDockNodeFlags_NoDockingSplitMe|ImGuiDockNodeFlags_NoDockingSplitOther):0);
+      globalWinFlags=0;
+      ImGui::DockSpaceOverViewport(NULL,lockLayout?(ImGuiDockNodeFlags_NoWindowMenuButton|ImGuiDockNodeFlags_NoMove|ImGuiDockNodeFlags_NoResize|ImGuiDockNodeFlags_NoCloseButton|ImGuiDockNodeFlags_NoDocking|ImGuiDockNodeFlags_NoDockingSplitMe|ImGuiDockNodeFlags_NoDockingSplitOther):0);
 
       drawSubSongs();
       drawPattern();