Comments + clear out VisibleWinodw field (should have no effect)

imgui.cpp

@@ -3164,7 +3164,7 @@ void ImGui::StartMouseMovingWindow(ImGuiWindow* window)
 {
     // Set ActiveId even if the _NoMove flag is set. Without it, dragging away from a window with _NoMove would activate hover on other windows.
     // We _also_ call this when clicking in a window empty space when io.ConfigWindowsMoveFromTitleBarOnly is set, but clear g.MovingWindow afterward.
-    // This is because we want ActiveId to be set even when the window is stuck from moving.
+    // This is because we want ActiveId to be set even when the window is not permitted to move.
     ImGuiContext& g = *GImGui;
     FocusWindow(window);
     SetActiveID(window->MoveId, window);
@@ -3252,7 +3252,8 @@ void ImGui::UpdateMouseMovingWindowEndFrame()
         }
         else if (g.NavWindow != NULL && GetFrontMostPopupModal() == NULL)
         {
-            FocusWindow(NULL);  // Clicking on void disable focus
+            // Clicking on void disable focus
+            FocusWindow(NULL);
         }
     }
 
@@ -5598,6 +5599,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         }
 
         // Draw window + handle manual resize
+        // As we highlight the title bar when want_focus is set, multiple reappearing windows will have have their title bar highlighted on their reappearing frame.
         const float window_rounding = window->WindowRounding;
         const float window_border_size = window->WindowBorderSize;
         const ImGuiWindow* window_to_highlight = g.NavWindowingTarget ? g.NavWindowingTarget : g.NavWindow;
@@ -10796,6 +10798,8 @@ static void ImGui::DockNodeRemoveWindow(ImGuiDockNode* node, ImGuiWindow* window
             break;
         }
     IM_ASSERT(erased);
+    if (node->VisibleWindow == window)
+        node->VisibleWindow = NULL;
 
     // Remove tab and possibly tab bar
     if (node->TabBar)