Fix macOS 14 Sonoma non-native full screen background color

Non-native full screen's configured background color (default to black)
stopped working when building using macOS 14 SDK, because the main
CoreText view was now drawing over it in drawRect, due to the new
clipToBounds property defaulting to false in macOS 14 SDK.

We could just fix this issue by setting clipToBounds to
true on the text view, but we would lose the benefits of the new
behavior which allows us to show tall texts (e.g. Tibetan texts or other
characters with composing chars) on the first line and not have it be
clipped at the top. Currently with the unclipped behavior, the character
can be drawn and poke up into the window frame or the notch area.

To properly fix this, just clip the background color fill in drawRect,
and allow texts etc to still draw outside the rect.

Author: ychin

src/MacVim/MMCoreTextView.m

@@ -760,6 +760,17 @@ - (void)drawRect:(NSRect)rect
     NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
     const BOOL clipTextToRow = [ud boolForKey:MMRendererClipToRowKey]; // Specify whether to clip tall characters by the row boundary.
 
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_14_0
+    // On macOS 14+ by default views don't clip their content, which is good as it allows tall texts
+    // on first line to be drawn fully without getting clipped. However, in this case we should make
+    // sure the background color fill is clipped properly, as otherwise it will interfere with
+    // non-native fullscreen's background color setting.
+    const BOOL clipBackground = !self.clipsToBounds;
+#else
+    const BOOL clipBackground = NO;
+#endif
+
     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 #if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_10
     CGContextRef ctx = context.CGContext;
@@ -791,7 +802,14 @@ - (void)drawRect:(NSRect)rect
     const unsigned defaultBg = defaultBackgroundColor.argbInt;
     CGContextSetFillColor(ctx, COMPONENTS(defaultBg));
 
+    if (clipBackground) {
+        CGContextSaveGState(ctx);
+        CGContextClipToRect(ctx, self.bounds);
+    }
     CGContextFillRect(ctx, rect);
+    if (clipBackground) {
+        CGContextRestoreGState(ctx);
+    }
 
     // Function to draw all rows
     void (^drawAllRows)(void (^)(CGContextRef,CGRect,int)) = ^(void (^drawFunc)(CGContextRef,CGRect,int)){

src/MacVim/MacVim.h

@@ -52,6 +52,9 @@
 #ifndef MAC_OS_VERSION_13_0
 # define MAC_OS_VERSION_13_0 130000
 #endif
+#ifndef MAC_OS_VERSION_14_0
+# define MAC_OS_VERSION_14_0 140000
+#endif
 
 #ifndef NSAppKitVersionNumber10_10
 # define NSAppKitVersionNumber10_10 1343