Examples: SDL+Vulkan: handle swap chain resize even without Vulkan returning VK_SUBOPTIMAL_KHR (#7671)

docs/CHANGELOG.txt

@@ -43,8 +43,9 @@ Breaking changes:
 
 Other changes:
 
-- Examples: GLFW+Vulkan: handle swap chain resize even without Vulkan returning
-  VK_SUBOPTIMAL_KHR, which doesn't seem to happen on Wayland. (#7671) [@AndreiNego]
+- Examples: GLFW+Vulkan, SDL+Vulkan: handle swap chain resize even without Vulkan
+  returning VK_SUBOPTIMAL_KHR, which doesn't seem to happen on Wayland. (#7671)
+  [@AndreiNego, @ocornut]
 
 
 -----------------------------------------------------------------------

examples/example_sdl2_vulkan/main.cpp

@@ -494,18 +494,15 @@ int main(int, char**)
         }
 
         // Resize swap chain?
-        if (g_SwapChainRebuild)
-        {
-            int width, height;
-            SDL_GetWindowSize(window, &width, &height);
-            if (width > 0 && height > 0)
+        int fb_width, fb_height;
+        SDL_GetWindowSize(window, &fb_width, &fb_height);
+        if (fb_width > 0 && fb_height > 0 && (g_SwapChainRebuild || g_MainWindowData.Width != fb_width || g_MainWindowData.Height != fb_height))
         {
             ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount);
-                ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, &g_MainWindowData, g_QueueFamily, g_Allocator, width, height, g_MinImageCount);
+            ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, &g_MainWindowData, g_QueueFamily, g_Allocator, fb_width, fb_height, g_MinImageCount);
             g_MainWindowData.FrameIndex = 0;
             g_SwapChainRebuild = false;
         }
-        }
 
         // Start the Dear ImGui frame
         ImGui_ImplVulkan_NewFrame();