SDL: emscripten: scale mousewheel X coordinates correctly, not just Y coordinates. (5c9f3)

SDL Commits
1 
From 5c9f37080e7f203cb45b9d1210cc5cb1363c9950 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 23 Oct 2024 23:35:02 -0400
Subject: [PATCH] emscripten: scale mousewheel X coordinates correctly, not
 just Y coordinates.

Fixes #10454.

(cherry picked from commit 00f15dd215b7fa9de754a5a9c5337d38895019bb)
---
 src/video/emscripten/SDL_emscriptenevents.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/video/emscripten/SDL_emscriptenevents.c b/src/video/emscripten/SDL_emscriptenevents.c
index 2017a6aee2b85..d54857bb8a2b3 100644
--- a/src/video/emscripten/SDL_emscriptenevents.c
+++ b/src/video/emscripten/SDL_emscriptenevents.c
@@ -714,20 +714,24 @@ static EM_BOOL Emscripten_HandleWheel(int eventType, const EmscriptenWheelEvent
     SDL_WindowData *window_data = userData;
 
     float deltaY = wheelEvent->deltaY;
+    float deltaX = wheelEvent->deltaX;
 
     switch (wheelEvent->deltaMode) {
     case DOM_DELTA_PIXEL:
         deltaY /= 100; /* 100 pixels make up a step */
+        deltaX /= 100; /* 100 pixels make up a step */
         break;
     case DOM_DELTA_LINE:
         deltaY /= 3; /* 3 lines make up a step */
+        deltaX /= 3; /* 3 lines make up a step */
         break;
     case DOM_DELTA_PAGE:
         deltaY *= 80; /* A page makes up 80 steps */
+        deltaX *= 80; /* A page makes up 80 steps */
         break;
     }
 
-    SDL_SendMouseWheel(window_data->window, 0, (float)wheelEvent->deltaX, -deltaY, SDL_MOUSEWHEEL_NORMAL);
+    SDL_SendMouseWheel(window_data->window, 0, deltaX, -deltaY, SDL_MOUSEWHEEL_NORMAL);
     return SDL_GetEventState(SDL_MOUSEWHEEL) == SDL_ENABLE;
 }