Fix #1394.

1 files changed, 0 insertions, 58 deletions

diff --git a/FrontEnd/src/utilities/hooks/useReverseScrollPositionRemember.ts b/FrontEnd/src/utilities/hooks/useReverseScrollPositionRemember.ts
deleted file mode 100644
index 339a12b8..00000000
--- a/FrontEnd/src/utilities/hooks/useReverseScrollPositionRemember.ts
+++ /dev/null
@@ -1,58 +0,0 @@
-// Not used now!!! But preserved for future use.
-
-import { useEffect } from "react";
-
-let on = false;
-
-let rememberedReversePosition = getReverseScrollPosition();
-
-export function getReverseScrollPosition(): number {
-  if (document.documentElement.scrollHeight <= window.innerHeight) {
-    return 0;
-  } else {
-    return (
-      document.documentElement.scrollHeight -
-      document.documentElement.scrollTop -
-      window.innerHeight
-    );
-  }
-}
-
-export function scrollToReverseScrollPosition(reversePosition: number): void {
-  if (document.documentElement.scrollHeight <= window.innerHeight) return;
-
-  const old = document.documentElement.style.scrollBehavior;
-  document.documentElement.style.scrollBehavior = "auto";
-
-  const newPosition =
-    document.documentElement.scrollHeight -
-    window.innerHeight -
-    reversePosition;
-
-  window.scrollTo(0, newPosition);
-
-  document.documentElement.style.scrollBehavior = old;
-}
-
-const scrollListener = (): void => {
-  rememberedReversePosition = getReverseScrollPosition();
-};
-
-const resizeObserver = new ResizeObserver(() => {
-  scrollToReverseScrollPosition(rememberedReversePosition);
-});
-
-export default function useReverseScrollPositionRemember(): void {
-  useEffect(() => {
-    if (on) return;
-    on = true;
-    window.addEventListener("scroll", scrollListener);
-    resizeObserver.observe(document.documentElement);
-
-    return () => {
-      resizeObserver.disconnect();
-      window.removeEventListener("scroll", scrollListener);
-      on = false;
-    };
-  }, []);
-}