Added MMTexturedWindow user default

Enable MMTexturedWindow to get textured window on Tiger (Leopard always
uses a textured window).

src/MacVim/MMAppController.m

@@ -112,6 +112,7 @@ typedef struct
         [NSNumber numberWithBool:NO],   MMAtsuiRendererKey,
         [NSNumber numberWithInt:MMUntitledWindowAlways],
                                         MMUntitledWindowKey,
+        [NSNumber numberWithBool:NO],   MMTexturedWindowKey,
         nil];
 
     [[NSUserDefaults standardUserDefaults] registerDefaults:dict];

src/MacVim/MMWindowController.m

@@ -128,7 +128,8 @@
 
     // Use textured background on Leopard or later (skip the 'if' on Tiger for
     // polished metal window).
-    if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_4)
+    if ([[NSUserDefaults standardUserDefaults] boolForKey:MMTexturedWindowKey]
+            || (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_4))
         styleMask |= NSTexturedBackgroundWindowMask;
 
     // NOTE: The content rect is only used the very first time MacVim is

src/MacVim/MacVim.h

@@ -218,6 +218,7 @@ extern NSString *MMNoFontSubstitutionKey;
 extern NSString *MMLoginShellKey;
 extern NSString *MMAtsuiRendererKey;
 extern NSString *MMUntitledWindowKey;
+extern NSString *MMTexturedWindowKey;
 
 // Enum for MMUntitledWindowKey
 enum {

src/MacVim/MacVim.m

@@ -99,6 +99,7 @@ NSString *MMNoFontSubstitutionKey       = @"MMNoFontSubstitution";
 NSString *MMLoginShellKey               = @"MMLoginShell";
 NSString *MMAtsuiRendererKey            = @"MMAtsuiRenderer";
 NSString *MMUntitledWindowKey           = @"MMUntitledWindow";
+NSString *MMTexturedWindowKey           = @"MMTexturedWindow";