SDL2/3: Windows mouse pointer position is incorrect after secondary display resize

[raiguard]

Ref: Factorio bug report

On Windows, if you change the resolution of a secondary display while an SDL app is running, the coordinates returned by SDL_GetMouseState become offset from the actual cursor position.

SDL-given cursor position is represented by the white square:

Reproduction

1. Connect two displays to a Windows machine
2. Change the resolution of the secondary display (display that the SDL app is not running on)
3. Observe discrepancy

Sample code:

#include <SDL3/SDL.h>
#include <stdlib.h>

#define SDL_MAIN_USE_CALLBACKS
#include <SDL3/SDL_main.h>

static SDL_Window* window = NULL;
static SDL_Renderer* renderer = NULL;

static const SDL_FRect rect = { .x = 100, .y = 100, .w = 100, .h = 100 };

SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {
  SDL_SetHint(SDL_HINT_EVENT_LOGGING, "1");

  SDL_CreateWindowAndRenderer("SDL test", 1280, 720, SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY, &window, &renderer);

  SDL_SetRenderVSync(renderer, 1);

  return SDL_APP_CONTINUE;
}

SDL_AppResult SDL_AppEvent(void* appstate, SDL_Event* event) {
  if (event->type == SDL_EVENT_QUIT)
    return SDL_APP_SUCCESS;

  return SDL_APP_CONTINUE;
}

SDL_AppResult SDL_AppIterate(void* appstate) {
  SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
  SDL_RenderClear(renderer);

  float mouseX, mouseY;
  SDL_GetMouseState(&mouseX, &mouseY);
  const bool mouseInRect = SDL_PointInRectFloat(&(SDL_FPoint){ .x = mouseX, .y = mouseY }, &rect);

  SDL_SetRenderDrawColor(renderer, mouseInRect ? 0 : 255, mouseInRect ? 150 : 0, 0, 255);
  SDL_RenderFillRect(renderer, &rect);

  SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
  SDL_RenderFillRect(renderer, &(SDL_FRect){.x = mouseX - 5, .y = mouseY - 5, .w = 10, .h = 10});

  SDL_RenderPresent(renderer);

  return SDL_APP_CONTINUE;
}

void SDL_AppQuit(void* appstate, SDL_AppResult result) {
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);

  SDL_Quit();
}

[Rseding91]

Additional information: it appears as though the "wrongness" is exactly the window decorations offset - as if the window decorations offset is not being applied.