Backends: GLFW: Fixed enabling ImGuiBackendFlags_HasMouseHoveredViewport broken by 950539b7.

As it turns out, back-end passing NULL hovered with HasMouseHoveredViewport is also broken which defeats some of its purpose.

examples/imgui_impl_glfw.cpp

@@ -166,7 +166,7 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;         // We can honor GetMouseCursor() values (optional)
     io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;          // We can honor io.WantSetMousePos requests (optional, rarely used)
     io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;    // We can create multi-viewports on the Platform side (optional)
-#if GLFW_HAS_GLFW_HOVERED && defined(_WIN32)
+#if GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
     io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can set io.MouseHoveredViewport correctly (optional, not easy)
 #endif
     io.BackendPlatformName = "imgui_impl_glfw";
@@ -348,7 +348,7 @@ static void ImGui_ImplGlfw_UpdateMousePosAndButtons()
         // rectangles and last focused time of every viewports it knows about. It will be unaware of other windows that may be sitting between or over your windows.
         // [GLFW] FIXME: This is currently only correct on Win32. See what we do below with the WM_NCHITTEST, missing an equivalent for other systems.
         // See https://github.com/glfw/glfw/issues/1236 if you want to help in making this a GLFW feature.
-#if GLFW_HAS_GLFW_HOVERED && defined(_WIN32)
+#if GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
         if (glfwGetWindowAttrib(window, GLFW_HOVERED) && !(viewport->Flags & ImGuiViewportFlags_NoInputs))
             io.MouseHoveredViewport = viewport->ID;
 #endif
@@ -586,7 +586,7 @@ static void ImGui_ImplGlfw_DestroyWindow(ImGuiViewport* viewport)
     {
         if (data->WindowOwned)
         {
-#if GLFW_HAS_GLFW_HOVERED && defined(_WIN32)
+#if GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
             HWND hwnd = (HWND)viewport->PlatformHandleRaw;
             ::RemovePropA(hwnd, "IMGUI_VIEWPORT");
 #endif
@@ -600,7 +600,7 @@ static void ImGui_ImplGlfw_DestroyWindow(ImGuiViewport* viewport)
 
 // We have submitted https://github.com/glfw/glfw/pull/1568 to allow GLFW to support "transparent inputs".
 // In the meanwhile we implement custom per-platform workarounds here (FIXME-VIEWPORT: Implement same work-around for Linux/OSX!)
-#if defined(_WIN32) && GLFW_HAS_GLFW_HOVERED
+#if GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
 static WNDPROC g_GlfwWndProc = NULL;
 static LRESULT CALLBACK WndProcNoInputs(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
@@ -634,7 +634,7 @@ static void ImGui_ImplGlfw_ShowWindow(ImGuiViewport* viewport)
     }
 
     // GLFW hack: install hook for WM_NCHITTEST message handler
-#if GLFW_HAS_GLFW_HOVERED && defined(_WIN32)
+#if GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
     ::SetPropA(hwnd, "IMGUI_VIEWPORT", viewport);
     if (g_GlfwWndProc == NULL)
         g_GlfwWndProc = (WNDPROC)::GetWindowLongPtr(hwnd, GWLP_WNDPROC);