Do quite a bit less work on resizing the timeline. Fix #175.

Evergreen/MainWindow/Timeline/Cell/TimelineCellLayout.swift

@@ -62,7 +62,8 @@ private func rectForDate(_ cellData: TimelineCellData, _ width: CGFloat, _ appea
 	r.origin.y = NSMaxY(titleRect) + appearance.titleBottomMargin
 	r.origin.x = appearance.boxLeftMargin
 	
-	r.size.width = max(width - (r.origin.x + appearance.cellPadding.right), 0.0)
+	r.size.width = min(width - (r.origin.x + appearance.cellPadding.right), r.size.width)
+	r.size.width = max(r.size.width, 0.0)
 
 	return r
 }

Evergreen/MainWindow/Timeline/Cell/TimelineTableCellView.swift

@@ -96,7 +96,6 @@ class TimelineTableCellView: NSTableCellView {
 		}
 		
 		super.setFrameSize(newSize)
-		updateSubviews()
 		needsLayout = true
 	}
 

Frameworks/RSTextDrawing/RSTextDrawing/RSSingleLineView.m

@@ -54,6 +54,9 @@ static NSAttributedString *emptyAttributedString = nil;
 
 - (void)setRenderer:(RSSingleLineRenderer *)renderer {
 
+	if (_renderer == renderer) {
+		return;
+	}
 	_renderer = renderer;
 	[self invalidateIntrinsicContentSize];
 	self.needsDisplay = YES;