🐛 Reuse scroll position on text editor's copy. Fixes #8765

✅ Update specs to avoid regressions

spec/text-editor-spec.coffee

@@ -88,6 +88,8 @@ describe "TextEditor", ->
     it "returns a different edit session with the same initial state", ->
       editor.setSelectedBufferRange([[1, 2], [3, 4]])
       editor.addSelectionForBufferRange([[5, 6], [7, 8]], reversed: true)
+      editor.firstVisibleScreenRow = 5
+      editor.firstVisibleScreenColumn = 5
       editor.foldBufferRow(4)
       expect(editor.isFoldedAtBufferRow(4)).toBeTruthy()
 
@@ -95,6 +97,8 @@ describe "TextEditor", ->
       expect(editor2.id).not.toBe editor.id
       expect(editor2.getSelectedBufferRanges()).toEqual editor.getSelectedBufferRanges()
       expect(editor2.getSelections()[1].isReversed()).toBeTruthy()
+      expect(editor2.getFirstVisibleScreenRow()).toBe 5
+      expect(editor2.getFirstVisibleScreenColumn()).toBe 5
       expect(editor2.isFoldedAtBufferRow(4)).toBeTruthy()
 
       # editor2 can now diverge from its origin edit session

src/text-editor.coffee

@@ -497,6 +497,7 @@ class TextEditor extends Model
     newEditor = new TextEditor({
       @buffer, displayBuffer, selectionsMarkerLayer, @tabLength, softTabs,
       suppressCursorCreation: true, @config, @notificationManager, @packageManager,
+      @firstVisibleScreenRow, @firstVisibleScreenColumn,
       @clipboard, @viewRegistry, @grammarRegistry, @project, @assert, @applicationDelegate
     })
     newEditor