Fix current line highlight opacity

CHANGELOG.md

@@ -9,6 +9,7 @@ Change Log
 
 - Fix an issue where the help button in the multiple replace window did not link to the suitable help page.
 - Fix an issue where "Show Mapping Conflict" menu item was always available even no conflict exists.
+- Fix an issue where the current line highlight was opaque in split editors although the editor background is non-opaque.
 - Fix an issue where unwanted debug log was printed in the Console.
 - Fix an unlocalized label.
 

CotEditor/Sources/EditorTextView.swift

@@ -1160,6 +1160,10 @@ final class EditorTextView: NSTextView, Themable {
         
         (self.layoutManager as? LayoutManager)?.invisiblesColor = theme.invisibles.color
         
+        if !self.isOpaque {
+            self.lineHighLightColor = self.lineHighLightColor?.withAlphaComponent(0.7)
+        }
+        
         // set scroller color considering background color
         self.enclosingScrollView?.scrollerKnobStyle = theme.isDarkTheme ? .light : .default