the editor has it's own blurred state independent of the window

src/app/editor.coffee

@@ -351,10 +351,12 @@ class Editor extends View
     @hiddenInput.on 'focus', =>
       @rootView()?.editorFocused(this)
       @isFocused = true
+      @removeClass 'is-blurred'
 
     @hiddenInput.on 'focusout', =>
       @isFocused = false
       @autosave() if config.get "editor.autosave"
+      @addClass 'is-blurred'
 
     @underlayer.on 'click', (e) =>
       return unless e.target is @underlayer[0]

static/editor.css

@@ -76,6 +76,10 @@
   opacity: 1;
 }
 
+.editor.is-blurred .line.cursor-line {
+  opacity: 0;
+}
+
 .editor .invisible {
   opacity: 0.2;
 }
@@ -156,3 +160,7 @@
   pointer-events: none;
   z-index: -1;
 }
+
+.editor.is-blurred .selection .region {
+  opacity: 0;
+}