Examples: DirectX12+Win32: also test for IsIconic() for sleeping since we don't seem to get a DXGI_STATUS_OCCLUDED signal when minimized. (#8603)

Amend ec1d2be96f. (#2496, #3907, #6308, #7615)
This technically prevents multi-viewports from working with io.ConfigViewportsNoDefaultParent=true but this is a more fringe case to handle for our example app, better tradeoff imho to use IsIconic().

docs/CHANGELOG.txt

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index e525376..852380a 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -115,6 +115,8 @@
 - Backends: Vulkan: Deep-copy ImGui_ImplVulkan_InitInfo::PipelineRenderingCreateInfo's
   pColorAttachmentFormats buffer when set, in order to reduce common user-error of
   specifying a pointer to data that gets out of scope. (#8282)
+- Examples: DirectX12+Win32: also test for IsIconic() for sleeping since we don't seem to
+  get a DXGI_STATUS_OCCLUDED signal when minimized. (#8603) [@dooann]
 
 
 -----------------------------------------------------------------------

examples/example_win32_directx12/main.cpp

diff --git a/examples/example_win32_directx12/main.cpp b/examples/example_win32_directx12/main.cpp
index 5f6cd51..2df2751 100644
--- a/examples/example_win32_directx12/main.cpp
+++ b/examples/example_win32_directx12/main.cpp
@@ -196,7 +196,7 @@
             break;
 
         // Handle window screen locked
-        if (g_SwapChainOccluded && g_pSwapChain->Present(0, DXGI_PRESENT_TEST) == DXGI_STATUS_OCCLUDED)
+        if ((g_SwapChainOccluded && g_pSwapChain->Present(0, DXGI_PRESENT_TEST) == DXGI_STATUS_OCCLUDED) || ::IsIconic(hwnd))
         {
             ::Sleep(10);
             continue;