Don’t mark parent views as opaque

The reason for this is that NSTextField will draw itself in the “faded” state (for non-key windows) unless some of its parent views are marked opaque.

The previous problem with not having the parent views opaque (see da3a91a7bb) seems to have been solved by setting the autohidesScrollers property to YES.

Frameworks/DocumentWindow/src/ProjectLayoutView.mm

@@ -314,11 +314,6 @@ NSString* const kUserDefaultsHTMLOutputSizeKey   = @"htmlOutputSize";
 	[self addCursorRect:[self htmlOutputResizeRect]  cursor:_htmlOutputOnRight ? [NSCursor resizeLeftRightCursor] : [NSCursor resizeUpDownCursor]];
 }
 
-- (BOOL)isOpaque
-{
-	return YES;
-}
-
 - (NSView*)hitTest:(NSPoint)aPoint
 {
 	if(NSMouseInRect([self convertPoint:aPoint fromView:[self superview]], [self fileBrowserResizeRect], [self isFlipped]))

Frameworks/OakTextView/src/OakDocumentView.mm

@@ -371,11 +371,6 @@ private:
 	}
 }
 
-- (BOOL)isOpaque
-{
-	return YES;
-}
-
 - (IBAction)toggleLineNumbers:(id)sender
 {
 	D(DBF_OakDocumentView, bug("show line numbers %s\n", BSTR([gutterView visibilityForColumnWithIdentifier:GVLineNumbersColumnIdentifier])););