Add offset to cycle to allow stepping in reverse

keyboards/whitefox/keymaps/konstantin/keymap.c

@@ -38,7 +38,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     return false;
 
   case CYCLEUC:
-    if (record->event.pressed) { cycle_unicode_input_mode(); }
+    if (record->event.pressed) { cycle_unicode_input_mode(+1); }
     return false;
 
   case NUMPAD:

quantum/process_keycode/process_unicode_common.c

@@ -56,9 +56,9 @@ void unicode_input_mode_init(void) {
   dprintf("input_mode init to: %u\n", unicode_config.input_mode);
 }
 
-void cycle_unicode_input_mode(void) {
+void cycle_unicode_input_mode(uint8_t offset) {
 #if UNICODE_SELECTED_MODES != -1
-  selected_index = (selected_index + 1) % selected_count;
+  selected_index = (selected_index + offset) % selected_count;
   unicode_config.input_mode = selected[selected_index];
   #if UNICODE_CYCLE_PERSIST
   persist_unicode_input_mode();

quantum/process_keycode/process_unicode_common.h

@@ -49,7 +49,7 @@ extern unicode_config_t unicode_config;
 void set_unicode_input_mode(uint8_t os_target);
 uint8_t get_unicode_input_mode(void);
 void unicode_input_mode_init(void);
-void cycle_unicode_input_mode(void);
+void cycle_unicode_input_mode(uint8_t offset);
 void persist_unicode_input_mode(void);
 
 void unicode_input_start(void);