Fix implicit-fallthrough warning

src/aui/tabartgtk.cpp

@@ -218,7 +218,7 @@ void wxAuiGtkTabArt::DrawTab(wxDC& dc, wxWindow* wnd, const wxAuiNotebookPage& p
             if (!page.active)
                 tab_rect.y += 2 * GTK_NOTEBOOK (wxGTKPrivate::GetNotebookWidget())->tab_hborder;
             gap_rect_y = tab_rect.y + tab_rect.height - GTK_NOTEBOOK (wxGTKPrivate::GetNotebookWidget())->tab_hborder / 2;
-            // fall through
+            wxFALLTHROUGH;
         case wxAUI_NB_BOTTOM:
             gap_start = tab_rect.x - GTK_NOTEBOOK (wxGTKPrivate::GetNotebookWidget())->tab_vborder / 2;
             gap_width = tab_rect.width;

src/common/txtstrm.cpp

@@ -148,8 +148,8 @@ wxChar wxTextInputStream::GetChar()
                 // remember the second one for the next call, as there is no
                 // way to fit both of them into a single wxChar in this case.
                 m_lastWChar = wbuf[1];
-#endif // SIZEOF_WCHAR_T == 2
                 wxFALLTHROUGH;
+#endif // SIZEOF_WCHAR_T == 2
 
             case 1:
                 m_validBegin = inlen + 1;

src/generic/timectrlg.cpp

@@ -288,7 +288,7 @@ private:
             case wxTE_HT_BELOW:
                 // This shouldn't happen for single line control.
                 wxFAIL_MSG( "Unreachable" );
-                // fall through
+                wxFALLTHROUGH;
 
             case wxTE_HT_BEYOND:
                 // Select the last field.

src/gtk/anybutton.cpp

@@ -393,7 +393,7 @@ void wxAnyButton::DoSetBitmapPosition(wxDirection dir)
         {
             default:
                 wxFAIL_MSG( "invalid position" );
-                // fall through
+                wxFALLTHROUGH;
 
             case wxLEFT:
                 gtkpos = GTK_POS_LEFT;

src/gtk/evtloop.cpp

@@ -301,7 +301,7 @@ static void wxgtk_main_do_event(GdkEvent* event, void* data)
         // examine the event itself to distinguish between the two cases but
         // this would be unnecessarily complicated).
         cat2 = wxEVT_CATEGORY_CLIPBOARD;
-        // Fall through.
+        wxFALLTHROUGH;
 
     case GDK_PROXIMITY_IN:
     case GDK_PROXIMITY_OUT:

src/gtk/menu.cpp

@@ -901,7 +901,7 @@ void wxMenu::GtkAppend(wxMenuItem* mitem, int pos)
             break;
         default:
             wxFAIL_MSG("unexpected menu item kind");
-            // fall through
+            wxFALLTHROUGH;
         case wxITEM_NORMAL:
 #ifdef __WXGTK4__
             //TODO GtkImageMenuItem is gone, have to implement it ourselves with

src/gtk/msgdlg.cpp

@@ -279,7 +279,7 @@ int wxMessageDialog::ShowModal()
     {
         default:
             wxFAIL_MSG(wxT("unexpected GtkMessageDialog return code"));
-            // fall through
+            wxFALLTHROUGH;
 
         case GTK_RESPONSE_CANCEL:
         case GTK_RESPONSE_DELETE_EVENT:

src/gtk/scrolwin.cpp

@@ -189,7 +189,7 @@ GtkPolicyType GtkPolicyFromWX(wxScrollbarVisibility visibility)
 
         default:
             wxFAIL_MSG( wxS("unknown scrollbar visibility") );
-            // fall through
+            wxFALLTHROUGH;
 
         case wxSHOW_SB_ALWAYS:
             policy = GTK_POLICY_ALWAYS;

src/gtk/toolbar.cpp

@@ -572,7 +572,7 @@ bool wxToolBar::DoInsertTool(size_t pos, wxToolBarToolBase *toolBase)
                     break;
                 default:
                     wxFAIL_MSG("unknown toolbar child type");
-                    // fall through
+                    wxFALLTHROUGH;
                 case wxITEM_DROPDOWN:
                 case wxITEM_NORMAL:
                     tool->m_item = gtk_tool_button_new(NULL, "");

src/gtk/window.cpp

@@ -5181,7 +5181,7 @@ void wxWindowGTK::GTKSendPaintEvents(const GdkRegion* region)
                     break;
                 }
             }
-            // fall through
+            wxFALLTHROUGH;
 
         case wxBG_STYLE_SYSTEM:
             if ( GetThemeEnabled() )

src/osx/carbon/font.cpp

@@ -472,6 +472,7 @@ wxFont::wxFont(wxOSXSystemFont font)
             break;
         case wxOSX_SYSTEM_FONT_FIXED:
             uifont = kCTFontUIFontUserFixedPitch;
+            break;
         default:
             break;
     }

src/unix/fontutil.cpp

@@ -229,7 +229,7 @@ void wxNativeFontInfo::SetStyle(wxFontStyle style)
             break;
         default:
             wxFAIL_MSG( "unknown font style" );
-            // fall through
+            wxFALLTHROUGH;
         case wxFONTSTYLE_NORMAL:
             pango_font_description_set_style( description, PANGO_STYLE_NORMAL );
             break;