fix scrollMax overflow bug in new Firefox

css/OverlayScrollbars.css

@@ -2,13 +2,13 @@
  * OverlayScrollbars
  * https://github.com/KingSora/OverlayScrollbars
  *
- * Version: 1.10.0
+ * Version: 1.10.1
  *
  * Copyright KingSora | Rene Haas.
  * https://github.com/KingSora
  *
  * Released under the MIT license.
- * Date: 11.10.2019
+ * Date: 30.12.2019
  */
 
 /*

js/OverlayScrollbars.js

@@ -2,13 +2,13 @@
  * OverlayScrollbars
  * https://github.com/KingSora/OverlayScrollbars
  *
- * Version: 1.10.0
+ * Version: 1.10.1
  *
  * Copyright KingSora | Rene Haas.
  * https://github.com/KingSora
  *
  * Released under the MIT license.
- * Date: 11.10.2019
+ * Date: 30.12.2019
  */
 
 (function (global, factory) {
@@ -3772,13 +3772,14 @@
                             var xy = scrollbarVars._x_y;
                             var wh = scrollbarVars._w_h;
                             var widthHeight = scrollbarVars._width_height;
-                            var scrollMax = _strScroll + scrollbarVars._Left_Top + 'Max';
+                            var scrollMax =  _strScroll + scrollbarVars._Left_Top + 'Max';
                             var fractionalOverflowAmount = viewportRect[widthHeight] ? MATH.abs(viewportRect[widthHeight] - _viewportSize[wh]) : 0;
+                            var checkFractionalOverflowAmount = previousOverflowAmount && previousOverflowAmount[xy] > 0 && _viewportElementNative[scrollMax] === 0;
                             overflowBehaviorIsVS[xy] = overflowBehavior[xy] === 'v-s';
                             overflowBehaviorIsVH[xy] = overflowBehavior[xy] === 'v-h';
                             overflowBehaviorIsS[xy] = overflowBehavior[xy] === 's';
                             overflowAmount[xy] = MATH.max(0, MATH.round((contentScrollSize[wh] - _viewportSize[wh]) * 100) / 100);
-                            overflowAmount[xy] *= (hideOverflowForceTextarea || (_viewportElementNative[scrollMax] === 0 && fractionalOverflowAmount > 0 && fractionalOverflowAmount < 1)) ? 0 : 1;
+                            overflowAmount[xy] *= (hideOverflowForceTextarea || (checkFractionalOverflowAmount && fractionalOverflowAmount > 0 && fractionalOverflowAmount < 1)) ? 0 : 1;
                             hasOverflow[xy] = overflowAmount[xy] > 0;
 
                             //hideOverflow:

js/jquery.overlayScrollbars.js

@@ -2,13 +2,13 @@
  * OverlayScrollbars
  * https://github.com/KingSora/OverlayScrollbars
  *
- * Version: 1.10.0
+ * Version: 1.10.1
  *
  * Copyright KingSora | Rene Haas.
  * https://github.com/KingSora
  *
  * Released under the MIT license.
- * Date: 11.10.2019
+ * Date: 30.12.2019
  */
 
 (function (global, factory) {
@@ -2674,7 +2674,7 @@
                         _hostSizeCache = hostSize;
 
                         var hideOverflowForceTextarea = _isTextarea && (_viewportSize.w === 0 || _viewportSize.h === 0);
-                        var previousOverflow = _overflowAmountCache;
+                        var previousOverflowAmount = _overflowAmountCache;
                         var overflowBehaviorIsVS = { };
                         var overflowBehaviorIsVH = { };
                         var overflowBehaviorIsS = { };
@@ -2690,13 +2690,14 @@
                             var xy = scrollbarVars._x_y;
                             var wh = scrollbarVars._w_h;
                             var widthHeight = scrollbarVars._width_height;
-                            var scrollMax = _strScroll + scrollbarVars._Left_Top + 'Max';
+                            var scrollMax =  _strScroll + scrollbarVars._Left_Top + 'Max';
                             var fractionalOverflowAmount = viewportRect[widthHeight] ? MATH.abs(viewportRect[widthHeight] - _viewportSize[wh]) : 0;
+                            var checkFractionalOverflowAmount = previousOverflowAmount && previousOverflowAmount[xy] > 0 && _viewportElementNative[scrollMax] === 0;
                             overflowBehaviorIsVS[xy] = overflowBehavior[xy] === 'v-s';
                             overflowBehaviorIsVH[xy] = overflowBehavior[xy] === 'v-h';
                             overflowBehaviorIsS[xy] = overflowBehavior[xy] === 's';
                             overflowAmount[xy] = MATH.max(0, MATH.round((contentScrollSize[wh] - _viewportSize[wh]) * 100) / 100);
-                            overflowAmount[xy] *= (hideOverflowForceTextarea || (_viewportElementNative[scrollMax] === 0 && fractionalOverflowAmount > 0 && fractionalOverflowAmount < 1)) ? 0 : 1;
+                            overflowAmount[xy] *= (hideOverflowForceTextarea || (checkFractionalOverflowAmount && fractionalOverflowAmount > 0 && fractionalOverflowAmount < 1)) ? 0 : 1;
                             hasOverflow[xy] = overflowAmount[xy] > 0;
 
                             //hideOverflow:
@@ -2915,7 +2916,7 @@
                                 var cursorIsLastPosition = (cursorPos >= cursorMax && _textareaHasFocus);
                                 var textareaScrollAmount = {
                                     x: (!textareaAutoWrapping && (cursorCol === lastCol && cursorRow === widestRow)) ? _overflowAmountCache.x : -1,
-                                    y: (textareaAutoWrapping ? cursorIsLastPosition || textareaRowsChanged && (previousOverflow !== undefined ? (currScroll.y === previousOverflow.y) : false) : (cursorIsLastPosition || textareaRowsChanged) && cursorRow === lastRow) ? _overflowAmountCache.y : -1
+                                    y: (textareaAutoWrapping ? cursorIsLastPosition || textareaRowsChanged && (previousOverflowAmount ? (currScroll.y === previousOverflowAmount.y) : false) : (cursorIsLastPosition || textareaRowsChanged) && cursorRow === lastRow) ? _overflowAmountCache.y : -1
                                 };
                                 currScroll.x = textareaScrollAmount.x > -1 ? (_isRTL && _normalizeRTLCache && _rtlScrollBehavior.i ? 0 : textareaScrollAmount.x) : currScroll.x; //if inverted, scroll to 0 -> normalized this means to max scroll offset.
                                 currScroll.y = textareaScrollAmount.y > -1 ? textareaScrollAmount.y : currScroll.y;

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "overlayscrollbars",
-    "version": "1.9.1",
+    "version": "1.10.0",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {