diff --git a/imgui.cpp b/imgui.cpp
index e02578b8..3c6c5a66 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -5398,6 +5398,15 @@ static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
     ImVec2 pos_target(FLT_MAX, FLT_MAX);
     ImVec2 size_target(FLT_MAX, FLT_MAX);
 
+    // Clip mouse interaction rectangles within the viewport (in practice the narrowing is going to happen most of the time).
+    // - Not narrowing would mostly benefit the situation where OS windows _without_ decoration have a threshold for hovering when outside their limits.
+    //   This is however not the case with current back-ends under Win32, but a custom borderless window implementation would benefit from it.
+    // - When decoration are enabled we typically benefit from that distance, but then our resize elements would be conflicting with OS resize elements, so we also narrow.
+    // - Note that we are unable to tell if the platform setup allows hovering with a distance threshold (on Win32, decorated window have such threshold).
+    ImRect clip_viewport_rect(-FLT_MAX, -FLT_MAX, +FLT_MAX, +FLT_MAX);
+    if (!(g.IO.BackendFlags & ImGuiBackendFlags_HasMouseHoveredViewport) || (g.IO.MouseHoveredViewport != window->ViewportId) || !(window->Viewport->Flags & ImGuiViewportFlags_NoDecoration))
+        clip_viewport_rect = window->Viewport->GetRect();
+
     // Resize grips and borders are on layer 1
     window->DC.NavLayerCurrent = ImGuiNavLayer_Menu;
     window->DC.NavLayerCurrentMask = (1 << ImGuiNavLayer_Menu);
@@ -5413,6 +5422,7 @@ static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
         ImRect resize_rect(corner - grip.InnerDir * grip_hover_outer_size, corner + grip.InnerDir * grip_hover_inner_size);
         if (resize_rect.Min.x > resize_rect.Max.x) ImSwap(resize_rect.Min.x, resize_rect.Max.x);
         if (resize_rect.Min.y > resize_rect.Max.y) ImSwap(resize_rect.Min.y, resize_rect.Max.y);
+        resize_rect.ClipWith(clip_viewport_rect);
         bool hovered, held;
         ButtonBehavior(resize_rect, window->GetID((void*)(intptr_t)resize_grip_n), &hovered, &held, ImGuiButtonFlags_FlattenChildren | ImGuiButtonFlags_NoNavFocus);
         //GetForegroundDrawList(window)->AddRect(resize_rect.Min, resize_rect.Max, IM_COL32(255, 255, 0, 255));
@@ -5440,8 +5450,9 @@ static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
     {
         bool hovered, held;
         ImRect border_rect = GetResizeBorderRect(window, border_n, grip_hover_inner_size, WINDOWS_RESIZE_FROM_EDGES_HALF_THICKNESS);
+        border_rect.ClipWith(clip_viewport_rect);
         ButtonBehavior(border_rect, window->GetID((void*)(intptr_t)(border_n + 4)), &hovered, &held, ImGuiButtonFlags_FlattenChildren);
-        //GetForegroundDrawLists(window)->AddRect(border_rect.Min, border_rect.Max, IM_COL32(255, 255, 0, 255));
+        //GetForegroundDrawList(window)->AddRect(border_rect.Min, border_rect.Max, IM_COL32(255, 255, 0, 255));
         if ((hovered && g.HoveredIdTimer > WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER) || held)
         {
             g.MouseCursor = (border_n & 1) ? ImGuiMouseCursor_ResizeEW : ImGuiMouseCursor_ResizeNS;
@@ -5461,6 +5472,10 @@ static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
     }
     PopID();
 
+    // Resize nav layer
+    window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
+    window->DC.NavLayerCurrentMask = (1 << ImGuiNavLayer_Main);
+
     // Navigation resize (keyboard/gamepad)
     if (g.NavWindowingTarget && g.NavWindowingTarget->RootWindow == window)
     {
@@ -5493,10 +5508,6 @@ static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
         MarkIniSettingsDirty(window);
     }
 
-    // Resize nav layer
-    window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
-    window->DC.NavLayerCurrentMask = (1 << ImGuiNavLayer_Main);
-
     window->Size = window->SizeFull;
     return ret_auto_fit;
 }