From c7a7aeb33b0e53c9188f58744892e6f4f03e3906 Mon Sep 17 00:00:00 2001
From: Ben McIntyre <email.ben.mcintyre@gmail.com>
Date: Fri, 30 Jun 2023 11:45:53 +1000
Subject: [PATCH] remove debounce on horizonal scroll, fixes #789

---
 slick.grid.js | 48 ++++++++++++++++++++++--------------------------
 1 file changed, 22 insertions(+), 26 deletions(-)

diff --git a/slick.grid.js b/slick.grid.js
index 0f9cd8bb..d57e57e2 100644
--- a/slick.grid.js
+++ b/slick.grid.js
@@ -108,7 +108,6 @@ if (typeof Slick === "undefined") {
       viewportMinWidthPx: undefined,
       viewportMaxWidthPx: undefined,
       suppressCssChangesOnHiddenInit: false,
-      scrollDebounceDelay: -1, // add a scroll delay to avoid screen flickering, -1 to disable delay
       ffMaxSupportedCssHeight: 6000000,
       maxSupportedCssHeight: 1000000000,
       sanitizer: undefined,  // sanitize function, built in basic sanitizer is: Slick.RegexSanitizer(dirtyHtml)
@@ -4350,34 +4349,31 @@ if (typeof Slick === "undefined") {
         prevScrollLeft = scrollLeft;
 
         // adjust scroll position of all div containers when scrolling the grid
-        // user can optionally provide "scrollDebounceDelay" grid option if flickering are a problem
-        utils.debounce(() => {
-          _viewportScrollContainerX.scrollLeft = scrollLeft;
-          _headerScrollContainer.scrollLeft = scrollLeft;
-          _topPanelScrollers[0].scrollLeft = scrollLeft;
-          if (options.createFooterRow) {
-            _footerRowScrollContainer.scrollLeft = scrollLeft;
-          }
-          if (options.createPreHeaderPanel) {
-            if (hasFrozenColumns()) {
-              _preHeaderPanelScrollerR.scrollLeft = scrollLeft;
-            } else {
-              _preHeaderPanelScroller.scrollLeft = scrollLeft;
-            }
-          }
-
+        _viewportScrollContainerX.scrollLeft = scrollLeft;
+        _headerScrollContainer.scrollLeft = scrollLeft;
+        _topPanelScrollers[0].scrollLeft = scrollLeft;
+        if (options.createFooterRow) {
+          _footerRowScrollContainer.scrollLeft = scrollLeft;
+        }
+        if (options.createPreHeaderPanel) {
           if (hasFrozenColumns()) {
-            if (hasFrozenRows) {
-              _viewportTopR.scrollLeft = scrollLeft;
-            }
-            _headerRowScrollerR.scrollLeft = scrollLeft; // right header row scrolling with frozen grid
+            _preHeaderPanelScrollerR.scrollLeft = scrollLeft;
           } else {
-            if (hasFrozenRows) {
-              _viewportTopL.scrollLeft = scrollLeft;
-            }
-            _headerRowScrollerL.scrollLeft = scrollLeft; // left header row scrolling with regular grid
+            _preHeaderPanelScroller.scrollLeft = scrollLeft;
           }
-        }, options.scrollDebounceDelay)();
+        }
+
+        if (hasFrozenColumns()) {
+          if (hasFrozenRows) {
+            _viewportTopR.scrollLeft = scrollLeft;
+          }
+          _headerRowScrollerR.scrollLeft = scrollLeft; // right header row scrolling with frozen grid
+        } else {
+          if (hasFrozenRows) {
+            _viewportTopL.scrollLeft = scrollLeft;
+          }
+          _headerRowScrollerL.scrollLeft = scrollLeft; // left header row scrolling with regular grid
+        }
       }
 
       // autoheight suppresses vertical scrolling, but editors can create a div larger than