Guard macOS 26 checks with __MAC_OS_X_VERSION_MAX_ALLOWED

Wrap uses of WX_IS_MACOS_AVAILABLE(26, 0) with compile-time
__MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0 checks so that
code compiled with older versions of Xcode 26 is not affects.

macOS 26 doesn't apply its new appearance to applications that weren't
compiled with Xcode 26+, so this is the correct thing to do: we do not
want any adjustments to apply to 26-unaware code.

include/wx/platform.h

@@ -470,6 +470,9 @@
 #        ifndef MAC_OS_VERSION_14_0
 #           define MAC_OS_VERSION_14_0 140000
 #        endif
+#        ifndef MAC_OS_VERSION_26_0
+#           define MAC_OS_VERSION_26_0 260000
+#        endif
 #        if __MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
 #            ifndef NSAppKitVersionNumber10_10
 #                define NSAppKitVersionNumber10_10 1343

src/osx/carbon/frame.cpp

@@ -128,11 +128,14 @@ wxStatusBar *wxFrame::OnCreateStatusBar(int number, long style, wxWindowID id,
 void wxFrame::SetStatusBar(wxStatusBar *statbar)
 {
     wxFrameBase::SetStatusBar(statbar);
+
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
     if ( WX_IS_MACOS_AVAILABLE(11, 0) )
     {
         // textured borders are unwanted, statusbar renders w/o them
     }
     else
+#endif
     {
         m_nowpeer->SetBottomBorderThickness(statbar ? GetMacStatusbarHeight() : 0);
     }

src/osx/carbon/statbrma.cpp

@@ -73,6 +73,7 @@ bool wxStatusBarMac::Create(wxWindow *parent, wxWindowID id,
 
 void wxStatusBarMac::InitColours()
 {
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
     if ( WX_IS_MACOS_AVAILABLE(26, 0) )
     {
         if ( wxSystemSettings::GetAppearance().IsDark() )
@@ -90,7 +91,10 @@ void wxStatusBarMac::InitColours()
             m_separator = wxColour(0xD9, 0xD9, 0xD9);
         }
     }
-    else if ( WX_IS_MACOS_AVAILABLE(11, 0) )
+    else
+#endif // MAC_OS_VERSION_26_0
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
+    if ( WX_IS_MACOS_AVAILABLE(11, 0) )
     {
         if ( wxSystemSettings::GetAppearance().IsDark() )
         {
@@ -111,7 +115,10 @@ void wxStatusBarMac::InitColours()
             m_separator = wxColour(0xCC, 0xCC, 0xCC);
         }
     }
-    else if ( WX_IS_MACOS_AVAILABLE(10, 14) )
+    else
+#endif // MAC_OS_VERSION_11_0
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
+    if ( WX_IS_MACOS_AVAILABLE(10, 14) )
     {
         if ( wxSystemSettings::GetAppearance().IsDark() )
         {
@@ -124,7 +131,9 @@ void wxStatusBarMac::InitColours()
             m_textInactive = wxColour(0xB1, 0xB1, 0xB1);
         }
     }
-    else // 10.10 Yosemite to 10.13:
+    else
+#endif // MAC_OS_X_VERSION_10_14
+    // 10.10 Yosemite to 10.13:
     {
         m_textActive = wxColour(0x40, 0x40, 0x40);
         m_textInactive = wxColour(0x4B, 0x4B, 0x4B);
@@ -153,11 +162,15 @@ void wxStatusBarMac::OnPaint(wxPaintEvent& WXUNUSED(event))
             break;
     }
 
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
     if ( WX_IS_MACOS_AVAILABLE(26, 0) )
     {
         // don't paint the background, handled by the OS
     }
-    else if ( WX_IS_MACOS_AVAILABLE(11, 0) )
+    else
+#endif
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
+    if ( WX_IS_MACOS_AVAILABLE(11, 0) )
     {
         // we _do_ need to paint the background on Big Sur up to Tahoe
         // to match Finder's appearance:
@@ -165,13 +178,16 @@ void wxStatusBarMac::OnPaint(wxPaintEvent& WXUNUSED(event))
         dc.Clear();
     }
     // else: background is rendered by OS, it is part of NSWindow border
+#endif
 
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
     // Draw horizontal separator above the status bar:
     if ( WX_IS_MACOS_AVAILABLE(11, 0) )
     {
         dc.SetPen(m_separator);
         dc.DrawLine(0, 0, GetSize().x, 0);
     }
+#endif
 
     // Draw the text:
 
@@ -188,11 +204,16 @@ void wxStatusBarMac::OnPaint(wxPaintEvent& WXUNUSED(event))
 
 void wxStatusBarMac::InitCornerInset()
 {
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
     if ( WX_IS_MACOS_AVAILABLE(26, 0) )
         m_cornerInset = 8;
-    else if ( WX_IS_MACOS_AVAILABLE(11, 0) )
+    else
+#endif
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
+    if ( WX_IS_MACOS_AVAILABLE(11, 0) )
         m_cornerInset = 4;
     else
+#endif
         m_cornerInset = 0;
 }
 

src/osx/cocoa/notebook.mm

@@ -91,11 +91,13 @@
         // On macOS 26 Tahoe, the mere presence of drawRect: in derived class,
         // even if it just calls super's implementation, triggers legacy
         // rendering of NSTabView.
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
         if (WX_IS_MACOS_AVAILABLE(26, 0))
         {
             wxOSXCocoaClassAddWXMethods(self, wxOSXSKIP_DRAW);
         }
         else
+#endif
         {
             wxOSXCocoaClassAddWXMethods(self);
         }

src/osx/spinbutt_osx.cpp

@@ -81,11 +81,13 @@ bool wxSpinButton::OSXHandleClicked( double WXUNUSED(timestampsec) )
 
 wxSize wxSpinButton::DoGetBestSize() const
 {
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
     if ( WX_IS_MACOS_AVAILABLE(26, 0) )
     {
         return wxSize(21, 28);
     }
     else
+#endif
     {
         return wxSize(13, 22);
     }

src/osx/textctrl_osx.cpp

@@ -232,8 +232,10 @@ wxSize wxTextCtrl::DoGetSizeFromTextSize(int xlen, int ylen) const
                 break ;
         }
 
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_26_0
         if ( WX_IS_MACOS_AVAILABLE(26, 0) )
             hText += 3;
+#endif
 
         // the numbers above include the border size, so subtract it before
         // possibly adding it back below