Merge pull request #43986 from Faless/js/3.x_em_fixes

[3.2] [HTML5] HiDPI, emscripten fixes

platform/javascript/js/libs/library_godot_os.js

@@ -200,7 +200,7 @@ const GodotFS = {
 				}
 				FS.mkdirTree(dir);
 			}
-			FS.writeFile(path, new Uint8Array(buffer), { 'flags': 'wx+' });
+			FS.writeFile(path, new Uint8Array(buffer));
 		},
 	},
 };

platform/javascript/os_javascript.cpp

@@ -174,8 +174,8 @@ void OS_JavaScript::set_window_size(const Size2 p_size) {
 			window_maximized = false;
 		}
 		double scale = godot_js_display_pixel_ratio_get();
-		emscripten_set_canvas_element_size(canvas_id, p_size.x * scale, p_size.y * scale);
-		emscripten_set_element_css_size(canvas_id, p_size.x, p_size.y);
+		emscripten_set_canvas_element_size(canvas_id, p_size.x, p_size.y);
+		emscripten_set_element_css_size(canvas_id, p_size.x / scale, p_size.y / scale);
 	}
 }