Fix non-native full screen show menu with notch, and changing resolution

runtime/doc/gui_mac.txt

@@ -370,11 +370,14 @@ MacVim can be used in full screen mode, see 'fullscreen'.
 
 There are two types of full screen modes.  By default, MacVim uses macOS'
 native full screen functionality, which creates a separate space in Mission
-Control.  MacVim also provides a non-native full screen mode, which can be set
-by disabling native full screen in the settings panel, or by setting
-|MMNativeFullScreen| to `NO` manually.  If you have a MacBook with a "notch"
-at the top of the screen, you can set |MMNonNativeFullScreenShowMenu| to `NO`
-and |MMNonNativeFullScreenSafeAreaBehavior| to 1 to utilitize the whole screen
+Control.
+
+MacVim also provides a non-native full screen mode, which can be set by
+disabling native full screen in the settings panel (see |MMNativeFullScreen|).
+Use 'fuoptions' to configure the background color and whether to maximize the
+rows/columns.  If you have a MacBook with a camera housing ("notch") at the
+top of the screen, you can set |MMNonNativeFullScreenShowMenu| to `NO` and
+|MMNonNativeFullScreenSafeAreaBehavior| to 1 to utilitize the whole screen
 (this will cause some of the content to be obscured by the notch).
 
 ==============================================================================

src/MacVim/MMFullScreenWindow.m

@@ -376,29 +376,48 @@ - (void)applicationDidChangeScreenParameters:(NSNotification *)notification
     [self setFrame:[screen frame] display:NO];
 }
 
-/// Get the view offset to allow us space to show the menu bar, or account for "safe area" (a.k.a. notch) in certain MacBook Pro's.
+/// Get the view offset to allow us space to show the menu bar, or account for "safe area" (a.k.a.
+/// notch) in certain MacBook Pro's.
 - (NSEdgeInsets) viewOffset {
     NSEdgeInsets offset = NSEdgeInsetsMake(0, 0, 0, 0);
 
+    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
+    const BOOL showMenu = [ud boolForKey:MMNonNativeFullScreenShowMenuKey];
+
 #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 (@available(macos 12.0, *)) {
-        const int safeAreaBehavior = [[NSUserDefaults standardUserDefaults]
-                                      integerForKey:MMNonNativeFullScreenSafeAreaBehaviorKey];
-
-        // The safe area utilization is configuration. Right now, we only have two choices.
-        // In the future there may be more, e.g. showing tabs in the safe area.
-        if (safeAreaBehavior == 0) {
-            offset = [[self screen] safeAreaInsets];
+        const int safeAreaBehavior = [ud integerForKey:MMNonNativeFullScreenSafeAreaBehaviorKey];
+
+        // The safe area utilization is configuration. Right now, we only have two choices:
+        // - 0: avoid the safe area (default)
+        // - 1: draw into the safe area, which would cause some contents to be obscured.
+        // In the future there may be more. E.g. we can draw tabs in the safe area.
+        // If menu is shown, we ignore this because this doesn't make sense.
+        if (safeAreaBehavior == 0 || showMenu) {
+            offset = [self screen].safeAreaInsets;
         }
     }
 #endif
 
-    if ([[NSUserDefaults standardUserDefaults]
-          boolForKey:MMNonNativeFullScreenShowMenuKey]) {
-        const CGFloat menuBarHeight = [[[NSApplication sharedApplication] mainMenu] menuBarHeight];
-        if (menuBarHeight > offset.top) {
-            offset.top = menuBarHeight;
+    if (showMenu) {
+        // Offset by menu height
+        if (offset.top == 0) {
+            const CGFloat menuBarHeight = [[[NSApplication sharedApplication] mainMenu] menuBarHeight];
+            if (menuBarHeight > offset.top) {
+                offset.top = menuBarHeight;
+            }
+        } else {
+            // Unfortunately, if there is a notch (safe area != 0), menuBarHeight does *not* return
+            // the menu height shown in the main screen, so we need to calculate it otherwise.
+            // visibleArea is supposed to give us this information but it's oddly off by one, leading
+            // to a one-pixel black line, so we need to manually increment it by one. Yes, it sucks.
+            NSRect visibleFrame = [self screen].visibleFrame;
+            visibleFrame.size.height += 1;
+            const CGFloat menuBarHeight = [self screen].frame.size.height - NSMaxY(visibleFrame);
+            if (menuBarHeight > offset.top) {
+                offset.top = menuBarHeight;
+            }
         }
     }
 
@@ -482,6 +501,16 @@ - (BOOL)isOnPrimaryScreen
     return selfScreenNum == primaryScreenNum;
 }
 
+/// Returns true when this screen has a dock and menu shown.
+///
+/// @note
+/// This does not reliably detect whether the dock is on the current screen or
+/// not as there is no API to reliably detect this. We are mostly guessing here
+/// but if the user sets the dock to display on left/right on a horizontal
+/// layout, it may be on the other screen.
+/// Also, technically when not using separate spaces, it's possible for the
+/// menu to be on one screen and dock on the other.
+/// This should be revisited in the future.
 - (BOOL)screenHasDockAndMenu
 {
     return NSScreen.screensHaveSeparateSpaces || [self isOnPrimaryScreen];

src/MacVim/MMWindowController.m

@@ -1278,7 +1278,17 @@ - (void)windowDidResize:(id)sender
     // Calling setFrameSizeKeepGUISize: instead of setFrameSize: prevents a
     // degenerate case where frameSizeMayHaveChanged: ends up resizing the window
     // *again* causing windowDidResize: to be called.
-    [vimView setFrameSizeKeepGUISize:[self contentSize]];
+    if (fullScreenWindow == nil) {
+        [vimView setFrameSizeKeepGUISize:[self contentSize]];
+    } else {
+        // Non-native full screen mode is more complicated and needs to
+        // re-layout the Vim view to properly account for the menu bar / notch,
+        // and misc fuopt configuration.
+        // This code is similar to what's done in processInputQueueDidFinish.
+        NSRect desiredFrame = [fullScreenWindow getDesiredFrame];
+        [vimView setFrameOrigin:desiredFrame.origin];
+        [vimView setFrameSizeKeepGUISize:desiredFrame.size];
+    }
 }
 
 - (void)windowDidChangeBackingProperties:(NSNotification *)notification