Don't render cursor line decorations in mini editors

spec/text-editor-component-spec.js

@@ -251,6 +251,19 @@ describe('TextEditorComponent', () => {
       expect(component.refs.gutterContainer).toBeUndefined()
       expect(element.querySelector('gutter-container')).toBeNull()
     })
+
+    it('does not render line decorations for the cursor line', async () => {
+      const {component, element, editor} = buildComponent({mini: true})
+      expect(element.querySelector('.line').classList.contains('cursor-line')).toBe(false)
+
+      editor.update({mini: false})
+      await component.getNextUpdatePromise()
+      expect(element.querySelector('.line').classList.contains('cursor-line')).toBe(true)
+
+      editor.update({mini: true})
+      await component.getNextUpdatePromise()
+      expect(element.querySelector('.line').classList.contains('cursor-line')).toBe(false)
+    })
   })
 
   describe('focus', () => {

src/text-editor.coffee

@@ -200,9 +200,7 @@ class TextEditor extends Model
 
     @decorationManager = new DecorationManager(@displayLayer)
     @decorateMarkerLayer(@selectionsMarkerLayer, type: 'cursor')
-    @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line-number', class: 'cursor-line')
-    @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line-number', class: 'cursor-line-no-selection', onlyHead: true, onlyEmpty: true)
-    @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line', class: 'cursor-line', onlyEmpty: true)
+    @decorateCursorLine() unless @isMini()
 
     @decorateMarkerLayer(@displayLayer.foldsMarkerLayer, {type: 'line-number', class: 'folded'})
 
@@ -225,6 +223,13 @@ class TextEditor extends Model
       priority: 0
       visible: lineNumberGutterVisible
 
+  decorateCursorLine: ->
+    @cursorLineDecorations = [
+      @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line', class: 'cursor-line', onlyEmpty: true),
+      @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line-number', class: 'cursor-line'),
+      @decorateMarkerLayer(@selectionsMarkerLayer, type: 'line-number', class: 'cursor-line-no-selection', onlyHead: true, onlyEmpty: true)
+    ]
+
   doBackgroundWork: (deadline) =>
     if @displayLayer.doBackgroundWork(deadline)
       @presenter?.updateVerticalDimensions()
@@ -297,6 +302,11 @@ class TextEditor extends Model
             displayLayerParams.invisibles = @getInvisibles()
             displayLayerParams.softWrapColumn = @getSoftWrapColumn()
             displayLayerParams.showIndentGuides = @doesShowIndentGuide()
+            if @mini
+              decoration.destroy() for decoration in @cursorLineDecorations
+              @cursorLineDecorations = null
+            else
+              @decorateCursorLine()
 
         when 'placeholderText'
           if value isnt @placeholderText