fix(behaviors): Capture mods for `&key_repeat`

* When tracking the last keycode, also capture the currently held
  explicit modifiers to use when replaying the key later.

app/src/behaviors/behavior_key_repeat.c

@@ -10,6 +10,7 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 #include <zmk/behavior.h>
+#include <zmk/hid.h>
 
 #include <zmk/event_manager.h>
 #include <zmk/events/keycode_state_changed.h>
@@ -93,6 +94,7 @@ static int key_repeat_keycode_state_changed_listener(const zmk_event_t *eh) {
         for (int u = 0; u < config->usage_pages_count; u++) {
             if (config->usage_pages[u] == ev->usage_page) {
                 memcpy(&data->last_keycode_pressed, ev, sizeof(struct zmk_keycode_state_changed));
+                data->last_keycode_pressed.implicit_modifiers |= zmk_hid_get_explicit_mods();
                 break;
             }
         }

app/tests/key-repeat/behavior_keymap.dtsi

@@ -10,7 +10,7 @@
 		default_layer {
 			bindings = <
 			&key_repeat &kp A
-			&kp B &kp C_VOL_UP
+			&kp LCTRL &kp C_VOL_UP
 			>;
 		};
 	};

app/tests/key-repeat/press-and-release-with-explicit-modifiers/events.patterns

@@ -0,0 +1,2 @@
+s/.*hid_listener_keycode_//p
+s/.*hid_implicit_modifiers_//p

app/tests/key-repeat/press-and-release-with-explicit-modifiers/keycode_events.snapshot

@@ -0,0 +1,12 @@
+pressed: usage_page 0x07 keycode 0xe0 implicit_mods 0x00 explicit_mods 0x00
+press: Modifiers set to 0x01
+pressed: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+press: Modifiers set to 0x01
+released: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+release: Modifiers set to 0x01
+released: usage_page 0x07 keycode 0xe0 implicit_mods 0x00 explicit_mods 0x00
+release: Modifiers set to 0x00
+pressed: usage_page 0x07 keycode 0x04 implicit_mods 0x01 explicit_mods 0x00
+press: Modifiers set to 0x01
+released: usage_page 0x07 keycode 0x04 implicit_mods 0x01 explicit_mods 0x00
+release: Modifiers set to 0x00

app/tests/key-repeat/press-and-release-with-explicit-modifiers/native_posix.keymap

@@ -0,0 +1,15 @@
+#include <dt-bindings/zmk/keys.h>
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/kscan_mock.h>
+#include "../behavior_keymap.dtsi"
+
+&kscan {
+	events = <
+	ZMK_MOCK_PRESS(1,0,10)
+	ZMK_MOCK_PRESS(0,1,10)
+	ZMK_MOCK_RELEASE(0,1,10)
+	ZMK_MOCK_RELEASE(1,0,10)
+	ZMK_MOCK_PRESS(0,0,10)
+	ZMK_MOCK_RELEASE(0,0,10)
+	>;
+};