SPIGOT-5542: Cancelling EntityToggleGlideEvent doesn't stop client from gliding

nms-patches/EntityHuman.patch

@@ -416,12 +416,20 @@
          } else {
              super.e(vec3d);
          }
-@@ -1467,12 +1648,17 @@
+@@ -1467,12 +1648,24 @@
      }
  
      public void startGliding() {
-+        if (!org.bukkit.craftbukkit.event.CraftEventFactory.callToggleGlideEvent(this, true).isCancelled()) // CraftBukkit
+-        this.setFlag(7, true);
-         this.setFlag(7, true);
++        // CraftBukkit start
++        if (!org.bukkit.craftbukkit.event.CraftEventFactory.callToggleGlideEvent(this, true).isCancelled()) {
++            this.setFlag(7, true);
++        } else {
++            // SPIGOT-5542: must toggle like below
++            this.setFlag(7, true);
++            this.setFlag(7, false);
++        }
++        // CraftBukkit end
      }
  
      public void stopGliding() {
@@ -434,7 +442,7 @@
      }
  
      @Override
-@@ -1687,26 +1873,31 @@
+@@ -1687,26 +1880,31 @@
  
      protected void releaseShoulderEntities() {
          if (this.e + 20L < this.world.getTime()) {