Workaround for that selection highlight remains between lines

CHANGELOG.md

@@ -26,6 +26,7 @@ Develop
 
 - Fix an issue where the Key Binding setting tables were empty on macOS 10.13 High Sierra.
 - Fix an issue where current line highlight was occasionally too wide when line height is 1.0.
+- Fix an issue where text selection highlight could remain between lines.
 - Fix an issue where the hanging-indent was not updated in specific cases.
 
 

CotEditor/Sources/EditorTextView.swift

@@ -127,6 +127,10 @@ final class EditorTextView: NSTextView, Themable {
         
         super.init(coder: coder)
         
+        // workaround for: the text selection highlight can remain between lines (2017-09 macOS 10.13).
+        self.scaleUnitSquare(to: NSSize(width: 1.001, height: 1.001))
+        self.scaleUnitSquare(to: self.convert(.unit, from: nil))  // reset scale
+        
         // setup layoutManager and textContainer
         let layoutManager = LayoutManager()
         layoutManager.allowsNonContiguousLayout = true