diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c32b323d..219a26df2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@
 - fix(indev) in LV_INDEV_TYPE_BUTTON recognize 1 cycle long presses too
 - fix(arc) make arc work with encoder
 - fix(slider) adjusting the left knob too with encoder
+- fix reference to LV_DRAW_BUF_MAX_NUM in lv_mem.c
+- fix(polygon draw) join adjacent points if they are on the same coordinate
 
 ## v7.7.2 (17.11.2020)
 ### Bugfixes
diff --git a/src/lv_core/lv_obj_style.c b/src/lv_core/lv_obj_style.c
index 41b0cfd81..bbe19152c 100644
--- a/src/lv_core/lv_obj_style.c
+++ b/src/lv_core/lv_obj_style.c
@@ -312,19 +312,11 @@ void _lv_obj_invalidate_style_cache(lv_obj_t * obj, uint8_t part, lv_style_prope
 {
     if(style_prop_is_cacheable(prop) == false) return;
 
-    if(part != LV_OBJ_PART_ALL) {
+    for(part = 0; part < _LV_OBJ_PART_MAX; part++) {
         lv_style_list_t * list = _lv_obj_get_style_list(obj, part);
-        if(list == NULL) return;
+        if(list == NULL) break;
         list->valid_cache = 0;
     }
-    else {
-
-        for(part = 0; part < _LV_OBJ_PART_MAX; part++) {
-            lv_style_list_t * list = _lv_obj_get_style_list(obj, part);
-            if(list == NULL) break;
-            list->valid_cache = 0;
-        }
-    }
 
     lv_obj_t * child = lv_obj_get_child(obj, NULL);
     while(child) {
diff --git a/src/lv_draw/lv_draw_arc.c b/src/lv_draw/lv_draw_arc.c
index fb11dba46..ed1dd5335 100644
--- a/src/lv_draw/lv_draw_arc.c
+++ b/src/lv_draw/lv_draw_arc.c
@@ -394,20 +394,11 @@ static void get_rounded_area(int16_t angle, lv_coord_t radius, uint8_t tickness,
     int32_t thick_half = tickness / 2;
     uint8_t thick_corr = (tickness & 0x01) ? 0 : 1;
 
-    int32_t rx_corr;
-    int32_t ry_corr;
-
-    if(angle > 90 && angle < 270) rx_corr = 0;
-    else  rx_corr = 0;
-
-    if(angle > 0 && angle < 180) ry_corr = 0;
-    else  ry_corr = 0;
-
     int32_t cir_x;
     int32_t cir_y;
 
-    cir_x = ((radius - rx_corr - thick_half) * _lv_trigo_sin(90 - angle)) >> (LV_TRIGO_SHIFT - ps);
-    cir_y = ((radius - ry_corr - thick_half) * _lv_trigo_sin(angle)) >> (LV_TRIGO_SHIFT - ps);
+    cir_x = ((radius - thick_half) * _lv_trigo_sin(90 - angle)) >> (LV_TRIGO_SHIFT - ps);
+    cir_y = ((radius - thick_half) * _lv_trigo_sin(angle)) >> (LV_TRIGO_SHIFT - ps);
 
     /* Actually the center of the pixel need to be calculated so apply 1/2 px offset*/
     if(cir_x > 0) {
diff --git a/src/lv_draw/lv_draw_triangle.c b/src/lv_draw/lv_draw_triangle.c
index 8ffa343e1..162b8d28e 100644
--- a/src/lv_draw/lv_draw_triangle.c
+++ b/src/lv_draw/lv_draw_triangle.c
@@ -58,29 +58,53 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
     if(point_cnt < 3) return;
     if(points == NULL) return;
 
-    int16_t i;
+    /*Join adjacent points if they are on the same coordinate*/
+    lv_point_t * p = _lv_mem_buf_get(point_cnt * sizeof(lv_point_t));
+    if(p == NULL) return;
+    uint16_t i;
+    uint16_t pcnt = 0;
+    p[0] = points[0];
+    for(i = 0; i < point_cnt - 1; i++) {
+        if(points[i].x != points[i+1].x ||points[i].y != points[i+1].y) {
+            p[pcnt] = points[i];
+            pcnt++;
+        }
+    }
+    /*The first and the last points are also adjacent */
+    if(points[0].x != points[point_cnt - 1].x || points[0].y != points[point_cnt - 1].y) {
+        p[pcnt] = points[point_cnt - 1];
+        pcnt++;
+    }
+
+    point_cnt = pcnt;
+    if(point_cnt < 3) {
+        _lv_mem_buf_release(p);
+        return;
+    }
+
     lv_area_t poly_coords = {.x1 = LV_COORD_MAX, .y1 = LV_COORD_MAX, .x2 = LV_COORD_MIN, .y2 = LV_COORD_MIN};
 
     for(i = 0; i < point_cnt; i++) {
-        poly_coords.x1 = LV_MATH_MIN(poly_coords.x1, points[i].x);
-        poly_coords.y1 = LV_MATH_MIN(poly_coords.y1, points[i].y);
-        poly_coords.x2 = LV_MATH_MAX(poly_coords.x2, points[i].x);
-        poly_coords.y2 = LV_MATH_MAX(poly_coords.y2, points[i].y);
+        poly_coords.x1 = LV_MATH_MIN(poly_coords.x1, p[i].x);
+        poly_coords.y1 = LV_MATH_MIN(poly_coords.y1, p[i].y);
+        poly_coords.x2 = LV_MATH_MAX(poly_coords.x2, p[i].x);
+        poly_coords.y2 = LV_MATH_MAX(poly_coords.y2, p[i].y);
     }
 
-
     bool is_common;
     lv_area_t poly_mask;
     is_common = _lv_area_intersect(&poly_mask, &poly_coords, clip_area);
-    if(!is_common) return;
-
+    if(!is_common) {
+        _lv_mem_buf_release(p);
+        return;
+    }
     /*Find the lowest point*/
-    lv_coord_t y_min = points[0].y;
+    lv_coord_t y_min = p[0].y;
     int16_t y_min_i = 0;
 
     for(i = 1; i < point_cnt; i++) {
-        if(points[i].y < y_min) {
-            y_min = points[i].y;
+        if(p[i].y < y_min) {
+            y_min = p[i].y;
             y_min_i = i;
         }
     }
@@ -109,10 +133,10 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
      *   dy_left/dx_left < dy_right/dx_right
      *   dy_left * dx_right < dy_right * dx_left
      */
-    lv_coord_t dxl = points[i_next_left].x - points[y_min_i].x;
-    lv_coord_t dxr = points[i_next_right].x - points[y_min_i].x;
-    lv_coord_t dyl = points[i_next_left].y - points[y_min_i].y;
-    lv_coord_t dyr = points[i_next_right].y - points[y_min_i].y;
+    lv_coord_t dxl = p[i_next_left].x - p[y_min_i].x;
+    lv_coord_t dxr = p[i_next_right].x - p[y_min_i].x;
+    lv_coord_t dyl = p[i_next_left].y - p[y_min_i].y;
+    lv_coord_t dyr = p[i_next_right].y - p[y_min_i].y;
 
     bool inv = false;
     if(dyl * dxr < dyr * dxl) inv = true;
@@ -133,11 +157,11 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
             if(i_next_right < 0) i_next_right = point_cnt + i_next_right;
         }
 
-        if(points[i_next_left].y >=  points[i_prev_left].y) {
-            if(points[i_next_left].y != points[i_prev_left].y &&
-               points[i_next_left].x !=  points[i_prev_left].x) {
-                lv_draw_mask_line_points_init(mp_next, points[i_prev_left].x, points[i_prev_left].y,
-                                              points[i_next_left].x, points[i_next_left].y,
+        if(p[i_next_left].y >=  p[i_prev_left].y) {
+            if(p[i_next_left].y != p[i_prev_left].y &&
+               p[i_next_left].x !=  p[i_prev_left].x) {
+                lv_draw_mask_line_points_init(mp_next, p[i_prev_left].x, p[i_prev_left].y,
+                                              p[i_next_left].x, p[i_next_left].y,
                                               LV_DRAW_MASK_LINE_SIDE_RIGHT);
                 lv_draw_mask_add(mp_next, mp);
                 mp_next++;
@@ -148,12 +172,12 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
 
         if(mask_cnt == point_cnt) break;
 
-        if(points[i_next_right].y >=  points[i_prev_right].y) {
-            if(points[i_next_right].y != points[i_prev_right].y &&
-               points[i_next_right].x !=  points[i_prev_right].x) {
+        if(p[i_next_right].y >=  p[i_prev_right].y) {
+            if(p[i_next_right].y != p[i_prev_right].y &&
+               p[i_next_right].x !=  p[i_prev_right].x) {
 
-                lv_draw_mask_line_points_init(mp_next, points[i_prev_right].x, points[i_prev_right].y,
-                                              points[i_next_right].x, points[i_next_right].y,
+                lv_draw_mask_line_points_init(mp_next, p[i_prev_right].x, p[i_prev_right].y,
+                                              p[i_next_right].x, p[i_next_right].y,
                                               LV_DRAW_MASK_LINE_SIDE_LEFT);
                 lv_draw_mask_add(mp_next, mp);
                 mp_next++;
@@ -169,6 +193,7 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
     lv_draw_mask_remove_custom(mp);
 
     _lv_mem_buf_release(mp);
+    _lv_mem_buf_release(p);
 
 }
 
diff --git a/src/lv_misc/lv_anim.c b/src/lv_misc/lv_anim.c
index b9bafcf00..0b3709d10 100644
--- a/src/lv_misc/lv_anim.c
+++ b/src/lv_misc/lv_anim.c
@@ -361,7 +361,7 @@ lv_anim_value_t lv_anim_path_bounce(const lv_anim_path_t * path, const lv_anim_t
     LV_UNUSED(path);
 
     /*Calculate the current step*/
-    uint32_t t;
+    int32_t t;
     if(a->time == a->act_time)
         t = 1024;
     else
@@ -380,31 +380,32 @@ lv_anim_value_t lv_anim_path_bounce(const lv_anim_path_t * path, const lv_anim_t
         t -= 408;
         t    = t * 5; /*to [0..1024] range*/
         t    = 1024 - t;
-        diff = diff / 6;
+        diff = diff / 20;
     }
     else if(t >= 614 && t < 819) {
         /*Fall back*/
         t -= 614;
         t    = t * 5; /*to [0..1024] range*/
-        diff = diff / 6;
+        diff = diff / 20;
     }
     else if(t >= 819 && t < 921) {
         /*Second bounce back*/
         t -= 819;
         t    = t * 10; /*to [0..1024] range*/
         t    = 1024 - t;
-        diff = diff / 16;
+        diff = diff / 40;
     }
     else if(t >= 921 && t <= 1024) {
         /*Fall back*/
         t -= 921;
         t    = t * 10; /*to [0..1024] range*/
-        diff = diff / 16;
+        diff = diff / 40;
     }
 
     if(t > 1024) t = 1024;
+    if(t < 0) t = 0;
 
-    int32_t step = _lv_bezier3(t, 1024, 1024, 800, 0);
+    int32_t step = _lv_bezier3(t, 1024, 800, 500, 0);
 
     int32_t new_value;
     new_value = (int32_t)step * diff;
diff --git a/src/lv_misc/lv_mem.c b/src/lv_misc/lv_mem.c
index 47d7bace3..597b6aebd 100644
--- a/src/lv_misc/lv_mem.c
+++ b/src/lv_misc/lv_mem.c
@@ -523,7 +523,7 @@ void * _lv_mem_buf_get(uint32_t size)
         }
     }
 
-    LV_DEBUG_ASSERT(false, "No free buffer. Increase LV_DRAW_BUF_MAX_NUM.", 0x00);
+    LV_DEBUG_ASSERT(false, "No free buffer. Increase LV_MEM_BUF_MAX_NUM.", 0x00);
     return NULL;
 }
 
diff --git a/src/lv_widgets/lv_slider.c b/src/lv_widgets/lv_slider.c
index 7372d149e..94073853f 100644
--- a/src/lv_widgets/lv_slider.c
+++ b/src/lv_widgets/lv_slider.c
@@ -379,9 +379,13 @@ static lv_res_t lv_slider_signal(lv_obj_t * slider, lv_signal_t sign, void * par
         lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
         if(indev_type == LV_INDEV_TYPE_ENCODER) {
             if(editing) {
-                if(ext->right_knob_focus == 0) ext->right_knob_focus = 1;
-                else {
-                    ext->right_knob_focus = 0;
+                if(lv_slider_get_type(slider) == LV_SLIDER_TYPE_RANGE) {
+                    if(ext->right_knob_focus == 0) ext->right_knob_focus = 1;
+                    else {
+                        ext->right_knob_focus = 0;
+                        lv_group_set_editing(g, false);
+                    }
+                } else {
                     lv_group_set_editing(g, false);
                 }
             }