Delegate get/setFirstVisibleScreenColumn from the model to the component

spec/text-editor-component-spec.js

@@ -2511,6 +2511,19 @@ describe('TextEditorComponent', () => {
       editor.setFirstVisibleScreenRow(11)
       expect(component.getFirstVisibleRow()).toBe(9)
     })
+
+    it('delegates setFirstVisibleScreenColumn and getFirstVisibleScreenColumn to the component', async () => {
+      const {component, element, editor} = buildComponent({rowsPerTile: 3, autoHeight: false})
+      element.style.width = 30 * component.getBaseCharacterWidth() + 'px'
+      await component.getNextUpdatePromise()
+
+      expect(editor.getFirstVisibleScreenColumn()).toBe(0)
+      component.setScrollLeft(5.5 * component.getBaseCharacterWidth())
+      expect(editor.getFirstVisibleScreenColumn()).toBe(5)
+
+      editor.setFirstVisibleScreenColumn(12)
+      expect(component.getScrollLeft()).toBe(Math.round(12 * component.getBaseCharacterWidth()))
+    })
   })
 })
 

src/text-editor-component.js

@@ -2325,6 +2325,14 @@ class TextEditorComponent {
     )
   }
 
+  getFirstVisibleColumn () {
+    return Math.floor(this.getScrollLeft() / this.getBaseCharacterWidth())
+  }
+
+  setFirstVisibleColumn (column) {
+    this.setScrollLeft(column * this.getBaseCharacterWidth())
+  }
+
   getVisibleTileCount () {
     return Math.floor((this.getLastVisibleRow() - this.getFirstVisibleRow()) / this.getRowsPerTile()) + 2
   }

src/text-editor.coffee

@@ -3681,8 +3681,11 @@ class TextEditor extends Model
   getVisibleRowRange: ->
     [@getFirstVisibleScreenRow(), @getLastVisibleScreenRow()]
 
-  setFirstVisibleScreenColumn: (@firstVisibleScreenColumn) ->
-  getFirstVisibleScreenColumn: -> @firstVisibleScreenColumn
+  setFirstVisibleScreenColumn: (column) ->
+    @getElement().component.setFirstVisibleColumn(column)
+
+  getFirstVisibleScreenColumn: ->
+    @getElement().component.getFirstVisibleColumn()
 
   getScrollTop: ->
     Grim.deprecate("This is now a view method. Call TextEditorElement::getScrollTop instead.")