message: Use add/remove Constraints function instead of activate/deactivate to support older macos versions (mac), closes
diff: @@ -154,7 +154,7 @@ NSString *upArrow = @"\u25B2";
  {
  if (!self.constraintsActive)
  {
  - [NSLayoutConstraint activateConstraints:[NSArray arrayWithObjects:self.leftConstraint, self.rightConstraint, self.heightConstraint, self.topConstraint, nil]];
  + [self.window.contentView addConstraints:[NSArray arrayWithObjects:self.leftConstraint, self.rightConstraint, self.heightConstraint, self.topConstraint, nil]];
  self.constraintsActive = YES;
  }
  [[self currentEditor] setSelectedRange:NSMakeRange(0, 0)];
  @@ -168,7 +168,7 @@ NSString *upArrow = @"\u25B2";
  {
  if (self.constraintsActive)
  {
  - [NSLayoutConstraint deactivateConstraints:[NSArray arrayWithObjects:self.leftConstraint, self.rightConstraint, self.heightConstraint, self.topConstraint, nil]];
  + [self.window.contentView removeConstraints:[NSArray arrayWithObjects:self.leftConstraint, self.rightConstraint, self.heightConstraint, self.topConstraint, nil]];
  self.constraintsActive = NO;
  }
  if (self.actionButton != nil)
  