[Helper] Add a rofi_fallthrough macro to tell compiler fallthrough is intentional

include/helper.h

@@ -455,6 +455,19 @@ void helper_select_next_matching_mode(void);
  * Switch to the previous matching method.
  */
 void helper_select_previous_matching_mode(void);
+
+/**
+ * Method to indicate fallthrough. This will help
+ * gcc/llvm warning/static code analysis.
+ */
+#if __has_attribute(__fallthrough__)
+#define rofi_fallthrough __attribute__((__fallthrough__))
+#else
+#define rofi_fallthrough                                                       \
+  do {                                                                         \
+  } while (0) /* fallthrough */
+#endif
+
 G_END_DECLS
 
 /**@} */

source/view.c

@@ -396,30 +396,30 @@ static void rofi_view_calculate_window_position(RofiViewState *state) {
   switch (location) {
   case WL_NORTH_WEST:
     state->x = CacheState.mon.x;
-  /* FALLTHRU */
+    rofi_fallthrough;
   case WL_NORTH:
     state->y = CacheState.mon.y;
     break;
   case WL_NORTH_EAST:
     state->y = CacheState.mon.y;
-  /* FALLTHRU */
+    rofi_fallthrough;
   case WL_EAST:
     state->x = CacheState.mon.x + CacheState.mon.w;
     break;
   case WL_SOUTH_EAST:
     state->x = CacheState.mon.x + CacheState.mon.w;
-  /* FALLTHRU */
+    rofi_fallthrough;
   case WL_SOUTH:
     state->y = CacheState.mon.y + CacheState.mon.h;
     break;
   case WL_SOUTH_WEST:
     state->y = CacheState.mon.y + CacheState.mon.h;
-  /* FALLTHRU */
+    rofi_fallthrough;
   case WL_WEST:
     state->x = CacheState.mon.x;
     break;
   case WL_CENTER:;
-  /* FALLTHRU */
+    rofi_fallthrough;
   default:
     break;
   }
@@ -2057,10 +2057,10 @@ void rofi_view_trigger_action(RofiViewState *state, BindingsScope scope,
       return;
     case WIDGET_TRIGGER_ACTION_RESULT_GRAB_MOTION_END:
       target = NULL;
-    /* FALLTHRU */
+      rofi_fallthrough;
     case WIDGET_TRIGGER_ACTION_RESULT_GRAB_MOTION_BEGIN:
       state->mouse.motion_target = target;
-    /* FALLTHRU */
+      rofi_fallthrough;
     case WIDGET_TRIGGER_ACTION_RESULT_HANDLED:
       return;
     }

source/widgets/listview.c

@@ -34,6 +34,7 @@
 #include <widgets/textbox.h>
 #include <widgets/widget.h>
 
+#include "helper.h"
 #include "settings.h"
 #include "theme.h"
 #include "view.h"
@@ -120,7 +121,7 @@ struct _listview {
   xcb_timestamp_t last_click;
   listview_mouse_activated_cb mouse_activated;
   void *mouse_activated_data;
-  
+
   listview_page_changed_cb page_callback;
 
   char *listview_name;
@@ -757,7 +758,7 @@ static WidgetTriggerActionResult listview_element_trigger_action(
     break;
   case ACCEPT_HOVERED_CUSTOM:
     custom = TRUE;
-  /* FALLTHRU */
+    rofi_fallthrough;
   case ACCEPT_HOVERED_ENTRY:
     listview_set_selected(lv, lv->last_offset + i);
     lv->mouse_activated(lv, custom, lv->mouse_activated_data);

source/xcb.c

@@ -1172,13 +1172,13 @@ static gboolean x11_button_to_nk_bindings_scroll(guint32 x11_button,
   switch (x11_button) {
   case 4:
     *steps = -1;
-  /* fallthrough */
+    rofi_fallthrough;
   case 5:
     *axis = NK_BINDINGS_SCROLL_AXIS_VERTICAL;
     break;
   case 6:
     *steps = -1;
-  /* fallthrough */
+    rofi_fallthrough;
   case 7:
     *axis = NK_BINDINGS_SCROLL_AXIS_HORIZONTAL;
     break;