fix(sticky keys): fix tapping-sticky-keys bug.

Sticky keys should be cleared when they were tapped in rapid succession before the timer runs out.

app/src/behaviors/behavior_sticky_key.c

@@ -127,9 +127,13 @@ static int on_sticky_key_binding_pressed(struct zmk_behavior_binding *binding,
                                          struct zmk_behavior_binding_event event) {
     struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_sticky_key_config *cfg = dev->config_info;
-
-    struct active_sticky_key *sticky_key =
-        store_sticky_key(event.position, binding->param1, binding->param2, cfg);
+    struct active_sticky_key *sticky_key;
+    sticky_key = find_sticky_key(event.position);
+    if (sticky_key != NULL) {
+        stop_timer(sticky_key);
+        release_sticky_key_behavior(sticky_key, event.timestamp);
+    }
+    sticky_key = store_sticky_key(event.position, binding->param1, binding->param2, cfg);
     if (sticky_key == NULL) {
         LOG_ERR("unable to store sticky key, did you press more than %d sticky_key?",
                 ZMK_BHV_STICKY_KEY_MAX_HELD);

app/tests/sticky-keys/9-sk-dn-up-dn-up/events.patterns

@@ -0,0 +1 @@
+s/.*hid_listener_keycode_//p

app/tests/sticky-keys/9-sk-dn-up-dn-up/keycode_events.snapshot

@@ -0,0 +1,4 @@
+pressed: usage_page 0x07 keycode 0xe1 mods 0x00
+released: usage_page 0x07 keycode 0xe1 mods 0x00
+pressed: usage_page 0x07 keycode 0xe1 mods 0x00
+released: usage_page 0x07 keycode 0xe1 mods 0x00

app/tests/sticky-keys/9-sk-dn-up-dn-up/native_posix.keymap

@@ -0,0 +1,27 @@
+#include <dt-bindings/zmk/keys.h>
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/kscan-mock.h>
+
+/ {
+	keymap {
+		compatible = "zmk,keymap";
+		label ="Default keymap";
+
+		default_layer {
+			bindings = <
+				&sk LEFT_SHIFT &none
+				&none &none
+			>;
+		};
+	};
+};
+
+&kscan {
+	events = <
+		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_RELEASE(0,0,10) 
+		/* the sticky key is pressed again, so the previous one must be cancelled */
+		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_RELEASE(0,0,1200)
+	>;
+};