Replaced deprecated calls to setNeedsDisplay with setting of property needsDisplay. Looks like -needsDisplay is available since macOS 10.0, so this does not increase Deployment Target.

Author: jerrykrinock

SSYAlert.m

@@ -147,7 +147,7 @@ - (void)configureForSSYAlertUsage {
 	// The next two lines are very important.  Took me many months to learn that,
 	// by default, NSTextViews will resize themselves automatically to accomodate
 	// a changed text size, and what's even more confusing is that they do so
-	// when you (or a superview) invoke -setNeedsDisplay: or -display on them.
+	// when you (or a superview) sets their `needsDisplay` property to YES.
 	// When used in SSYAlert, SSYAlert wants to set their size manually, in its
 	// -display method.  In particular, if SSYAlert's ivar allowsShrinking is set
 	// to NO, in fact we want them to maintain their height when automatic resizing
@@ -206,7 +206,7 @@ @interface SSYAlert ()
 @implementation SSYAlertWindow
 
 - (NSInteger)checkboxState {
-    NSInteger state = NSMixedState ; // default answer in case we can't find checkbox
+    NSInteger state = NSControlStateValueMixed ; // default answer in case we can't find checkbox
     BOOL didFindCheckbox = NO ;
     for (NSView* view in [[self contentView] subviews]) {
         if ([view isKindOfClass:[SSYWrappingCheckbox class]]) {
@@ -219,7 +219,7 @@ - (NSInteger)checkboxState {
 
     if (!didFindCheckbox) {
         // Until BookMacster 1.22.4, logged Internal Error 624-9382
-        state = NSOffState ;
+        state = NSControlStateValueOff ;
     }
 
     return state ;
@@ -816,7 +816,7 @@ - (IBAction)clickedButton:(id)sender {
                                              object:self] ;
 	}
 
-    if ([self checkboxState] == NSOnState) {
+    if ([self checkboxState] == NSControlStateValueOn) {
         [[self checkboxInvocation] invoke] ;
     }
 

SSYPopUpTableHeaderCell.m

@@ -112,7 +112,7 @@ - (void)performClickWithFrame:(NSRect)frame
          to controlView, but decided that, since I don't understand what
          Apple is doing or not doing with controlView, it would be safer
          to use a private property. */
-        [self.headerView setNeedsDisplay:YES] ;
+        self.headerView.needsDisplay=YES;
     }
 }
 

SSYProgressView.m

@@ -412,7 +412,7 @@ - (void)unsafeSizeToFitTextOnly:(BOOL)textOnly {
 		[[self textField] setToolTip:nil] ;
 	}
 
-	[self setNeedsDisplay:YES] ;
+    self.needsDisplay = YES;
 }
 
 - (void)unsafeSetHasCancelButtonWithTarget:(id)target

SSYSidebarController.m

@@ -249,8 +249,8 @@ - (void)regardlesslyExpandSidebar:(BOOL)expand
         [self.sidebarView setFrame:sidebarFrame];
     }
 
-    [self.mainView setNeedsDisplay: YES];
-    [self.sidebarView setNeedsDisplay:YES];
+    self.mainView.needsDisplay = YES;
+    self.sidebarView.needsDisplay = YES;
 }