Drag and Drop: minor refactor into a helper RenderDragDropTargetRectForViewport() function.

diff --git a/imgui.cpp b/imgui.cpp
index 105b6c2..90a80a3 100644
--- a/imgui.cpp
+++ b/imgui.cpp

@@ -15357,15 +15357,9 @@
     flags |= (g.DragDropSourceFlags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect); // Source can also inhibit the preview (useful for external sources that live for 1 frame)
     const bool draw_target_rect = payload.Preview && !(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect);
     if (draw_target_rect && g.DragDropTargetFullViewport != 0)
-    {
-        ImRect bb = g.DragDropTargetRect;
-        bb.Expand(-3.5f);
-        RenderDragDropTargetRectEx(GetForegroundDrawList(), bb, g.Style.DragDropTargetRounding);
-    }
+        RenderDragDropTargetRectForViewport(g.DragDropTargetFullViewport, g.DragDropTargetRect);
     else if (draw_target_rect)
-    {
         RenderDragDropTargetRectForItem(r);
-    }
 
     g.DragDropAcceptFrameCount = g.FrameCount;
     if ((g.DragDropSourceFlags & ImGuiDragDropFlags_SourceExtern) && g.DragDropMouseButton == -1)
@@ -15396,6 +15390,17 @@
         window->DrawList->PopClipRect();
 }
 
+void ImGui::RenderDragDropTargetRectForViewport(ImGuiID viewport_id, const ImRect& bb)
+{
+    IM_ASSERT(viewport_id != 0);
+    IM_UNUSED(viewport_id); // Unused in this branch
+    ImGuiContext& g = *GImGui;
+    ImGuiViewport* viewport = g.Viewports[0];
+    ImRect bb_padded = bb;
+    bb_padded.Expand(-g.Style.DragDropTargetPadding);
+    RenderDragDropTargetRectEx(GetForegroundDrawList(viewport), bb_padded, g.Style.DragDropTargetRounding);
+}
+
 void ImGui::RenderDragDropTargetRectEx(ImDrawList* draw_list, const ImRect& bb, float rounding)
 {
     ImGuiContext& g = *GImGui;

diff --git a/imgui_internal.h b/imgui_internal.h
index 924da06..bac5b33 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h

@@ -3354,7 +3354,7 @@
     // - You are calling ImGui functions after ImGui::EndFrame()/ImGui::Render() and before the next ImGui::NewFrame(), which is also illegal.
     IMGUI_API ImGuiIO&         GetIO(ImGuiContext* ctx);
     IMGUI_API ImGuiPlatformIO& GetPlatformIO(ImGuiContext* ctx);
-    inline    float         GetScale()                  { ImGuiContext& g = *GImGui; return g.Style._MainScale; } // FIXME-DPI: I don't want to formalize this just yet. Because reasons. Please don't use.
+    inline    float         GetScale()                  { ImGuiContext& g = *GImGui; return g.Style._MainScale; } // FIXME-DPI: PLEASE DO NOT USE. I don't want to formalize this just yet. Because reasons.
     inline    ImGuiWindow*  GetCurrentWindowRead()      { ImGuiContext& g = *GImGui; return g.CurrentWindow; }
     inline    ImGuiWindow*  GetCurrentWindow()          { ImGuiContext& g = *GImGui; g.CurrentWindow->WriteAccessed = true; return g.CurrentWindow; }
     IMGUI_API ImGuiWindow*  FindWindowByID(ImGuiID id);
@@ -3674,6 +3674,7 @@
     IMGUI_API void          ClearDragDrop();
     IMGUI_API bool          IsDragDropPayloadBeingAccepted();
     IMGUI_API void          RenderDragDropTargetRectForItem(const ImRect& bb);
+    IMGUI_API void          RenderDragDropTargetRectForViewport(ImGuiID viewport_id, const ImRect& bb);
     IMGUI_API void          RenderDragDropTargetRectEx(ImDrawList* draw_list, const ImRect& bb, float rounding);
 
     // Typing-Select API