From a231c680364bc1f2070f26f449e5f9d6519d58f6 Mon Sep 17 00:00:00 2001
From: Ronan Cailleau <ro.cailleau@gmail.com>
Date: Sat, 29 Aug 2026 20:29:54 +0200
Subject: [PATCH] Viewports, SDL3: Fix secondary viewports collapse sizing

- Fixes incorrect reduced size when un-collapsing window in secondary viewport
- SImilar to #2756
---
 backends/imgui_impl_sdl3.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/backends/imgui_impl_sdl3.cpp b/backends/imgui_impl_sdl3.cpp
index 2b26db377..89a58307a 100644
--- a/backends/imgui_impl_sdl3.cpp
+++ b/backends/imgui_impl_sdl3.cpp
@@ -526,7 +526,13 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
             if (event->type == SDL_EVENT_WINDOW_MOVED)
                 viewport->PlatformRequestMove = true;
             if (event->type == SDL_EVENT_WINDOW_RESIZED)
-                viewport->PlatformRequestResize = true;
+            {
+                int x = int(viewport->Size.x), y = int(viewport->Size.y);
+                if (x != event->window.data1 || y != event->window.data2)
+                {
+                    viewport->PlatformRequestResize = true;
+                }
+            }
             return true;
         }
         case SDL_EVENT_GAMEPAD_ADDED: