Docking: fixed various rendering issues and ability to have rounded floating dock nodes. Amend 91ce8cc. (#6993, #6151)

imgui.cpp

diff --git a/imgui.cpp b/imgui.cpp
index 8319700..a04e61b 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -8219,10 +8219,12 @@
 
         // Lock window rounding for the frame (so that altering them doesn't cause inconsistencies)
         // Large values tend to lead to variety of artifacts and are not recommended.
-        if (window->RootWindowDockTree->ViewportOwned)
+        if ((flags & ImGuiWindowFlags_ChildWindow) && !window->DockIsActive)
+            window->WindowRounding = style.ChildRounding;
+        else if (window->RootWindowDockTree->ViewportOwned)
             window->WindowRounding = 0.0f;
         else
-            window->WindowRounding = ((flags & ImGuiWindowFlags_ChildWindow) && !window->DockIsActive) ? style.ChildRounding : ((flags & ImGuiWindowFlags_Popup) && !(flags & ImGuiWindowFlags_Modal)) ? style.PopupRounding : style.WindowRounding;
+            window->WindowRounding = ((flags & ImGuiWindowFlags_Popup) && !(flags & ImGuiWindowFlags_Modal)) ? style.PopupRounding : style.WindowRounding;
 
         // For windows with title bar or menu bar, we clamp to FrameHeight(FontSize + FramePadding.y * 2.0f) to completely hide artifacts.
         //if ((window->Flags & ImGuiWindowFlags_MenuBar) || !(window->Flags & ImGuiWindowFlags_NoTitleBar))