bugfix(sticky keys): release active sticky keys properly

see https://github.com/zmkfirmware/zmk/issues/445

app/src/behaviors/behavior_sticky_key.c

@@ -213,6 +213,8 @@ static int sticky_key_keycode_state_changed_listener(const struct zmk_event_head
                 sticky_key->modified_key_usage_page == ev->usage_page &&
                 sticky_key->modified_key_keycode == ev->keycode) {
                 release_sticky_key_behavior(sticky_key, ev->timestamp);
+                stop_timer(sticky_key);
+                clear_sticky_key(sticky_key);
             }
         }
     }

app/tests/sticky-keys/2-os-dn-up-kcdn-kcup/keycode_events.snapshot

@@ -2,3 +2,7 @@ pressed: usage_page 0x07 keycode 0x08 mods 0x00
 pressed: usage_page 0x07 keycode 0x04 mods 0x00
 released: usage_page 0x07 keycode 0x08 mods 0x00
 released: usage_page 0x07 keycode 0x04 mods 0x00
+pressed: usage_page 0x07 keycode 0x08 mods 0x00
+pressed: usage_page 0x07 keycode 0x04 mods 0x00
+released: usage_page 0x07 keycode 0x08 mods 0x00
+released: usage_page 0x07 keycode 0x04 mods 0x00

app/tests/sticky-keys/2-os-dn-up-kcdn-kcup/native_posix.keymap

@@ -9,5 +9,11 @@
 		ZMK_MOCK_RELEASE(0,0,10) 
 		ZMK_MOCK_PRESS(1,0,10)
 		ZMK_MOCK_RELEASE(1,0,10)
+
+		/* repeat test to check if cleanup is done correctly */
+		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_RELEASE(0,0,10) 
+		ZMK_MOCK_PRESS(1,0,10)
+		ZMK_MOCK_RELEASE(1,0,10)
 	>;
 };

app/tests/sticky-keys/8-lsk-osk-combination/events.patterns

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

app/tests/sticky-keys/8-lsk-osk-combination/keycode_events.snapshot

@@ -0,0 +1,8 @@
+pressed: usage_page 0x07 keycode 0xe0 mods 0x00
+pressed: usage_page 0x07 keycode 0x1c mods 0x00
+released: usage_page 0x07 keycode 0xe0 mods 0x00
+released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0xe0 mods 0x00
+pressed: usage_page 0x07 keycode 0x1c mods 0x00
+released: usage_page 0x07 keycode 0xe0 mods 0x00
+released: usage_page 0x07 keycode 0x1c mods 0x00

app/tests/sticky-keys/8-lsk-osk-combination/native_posix.keymap

@@ -0,0 +1,47 @@
+#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 E &sl 1
+				&kp A &kp B>;
+		};
+
+		lower_layer {
+			bindings = <
+				&sk LEFT_CONTROL &kp X
+				&kp Y  &kp Z>;
+		};
+	};
+};
+
+&kscan {
+	events = <
+		/* tap sl lower_layer */
+		ZMK_MOCK_PRESS(0,1,10) 
+		ZMK_MOCK_RELEASE(0,1,10) 
+		/* tap sk LEFT_CONTROL */
+		ZMK_MOCK_PRESS(0,0,10)
+		ZMK_MOCK_RELEASE(0,0,10)
+		/* tap Y */
+		ZMK_MOCK_PRESS(1,0,10) 
+		ZMK_MOCK_RELEASE(1,0,10) 
+		
+		/* repeat */
+		/* tap sl */
+		ZMK_MOCK_PRESS(0,1,10) 
+		ZMK_MOCK_RELEASE(0,1,10) 
+		/* tap sk */
+		ZMK_MOCK_PRESS(0,0,10)
+		ZMK_MOCK_RELEASE(0,0,10)
+		/* tap Y */
+		ZMK_MOCK_PRESS(1,0,10) 
+		ZMK_MOCK_RELEASE(1,0,10) 
+	>;
+};