Merge pull request #1268 from ychin/fix-10.9-transparent-titlebar-crash

Fix crashing on 10.9

Author: ychin

src/MacVim/MMCoreTextView.m

@@ -734,7 +734,12 @@ - (void)setNeedsDisplayFromRow:(int)row column:(int)col toRow:(int)row2
 - (void)drawRect:(NSRect)rect
 {
     NSGraphicsContext *context = [NSGraphicsContext currentContext];
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_10
     CGContextRef ctx = context.CGContext;
+#else
+    CGContextRef ctx = [context graphicsPort];
+#endif
+
     [context setShouldAntialias:antialias];
     {
         CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);

src/MacVim/MMFullScreenWindow.m

@@ -382,7 +382,7 @@ - (NSEdgeInsets) viewOffset {
 
 #if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_12_0)
     // Account for newer MacBook Pro's which have a notch, which can be queried using the safe area API.
-    if ([NSScreen instancesRespondToSelector:@selector(safeAreaInsets)]) {
+    if (@available(macos 12.0, *)) {
         const int safeAreaBehavior = [[NSUserDefaults standardUserDefaults]
                                       integerForKey:MMNonNativeFullScreenSafeAreaBehaviorKey];
 

src/MacVim/MMWindowController.m

@@ -571,8 +571,12 @@ - (void)refreshApperanceMode
     // has selected as a preference.
 
     // Transparent title bar setting
-    decoratedWindow.titlebarAppearsTransparent = [[NSUserDefaults standardUserDefaults]
-                                                  boolForKey:MMTitlebarAppearsTransparentKey];
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_10
+    if (@available(macos 10.10, *)) {
+        decoratedWindow.titlebarAppearsTransparent = [[NSUserDefaults standardUserDefaults]
+                                                      boolForKey:MMTitlebarAppearsTransparentKey];
+    }
+#endif
 
     // No title bar setting
     if ([[NSUserDefaults standardUserDefaults]