Avoid temporarily clearing DisplayLayer params in TextEditor.copy

src/text-editor.coffee

@@ -114,9 +114,6 @@ class TextEditor extends Model
         throw error
 
     state.buffer = state.tokenizedBuffer.buffer
-    if state.displayLayer = state.buffer.getDisplayLayer(state.displayLayerId)
-      state.selectionsMarkerLayer = state.displayLayer.getMarkerLayer(state.selectionsMarkerLayerId)
-
     state.assert = atomEnvironment.assert.bind(atomEnvironment)
     editor = new this(state)
     if state.registered
@@ -167,22 +164,24 @@ class TextEditor extends Model
       grammar, tabLength, @buffer, @largeFileMode, @assert
     })
 
-    displayLayerParams = {
-      invisibles: @getInvisibles(),
-      softWrapColumn: @getSoftWrapColumn(),
-      showIndentGuides: not @isMini() and @doesShowIndentGuide(),
-      atomicSoftTabs: params.atomicSoftTabs ? true,
-      tabLength: tabLength,
-      ratioForCharacter: @ratioForCharacter.bind(this),
-      isWrapBoundary: isWrapBoundary,
-      foldCharacter: ZERO_WIDTH_NBSP,
-      softWrapHangingIndent: params.softWrapHangingIndentLength ? 0
-    }
+    unless @displayLayer?
+      displayLayerParams = {
+        invisibles: @getInvisibles(),
+        softWrapColumn: @getSoftWrapColumn(),
+        showIndentGuides: not @isMini() and @doesShowIndentGuide(),
+        atomicSoftTabs: params.atomicSoftTabs ? true,
+        tabLength: tabLength,
+        ratioForCharacter: @ratioForCharacter.bind(this),
+        isWrapBoundary: isWrapBoundary,
+        foldCharacter: ZERO_WIDTH_NBSP,
+        softWrapHangingIndent: params.softWrapHangingIndentLength ? 0
+      }
 
-    if @displayLayer?
-      @displayLayer.reset(displayLayerParams)
-    else
-      @displayLayer = @buffer.addDisplayLayer(displayLayerParams)
+      if @displayLayer = @buffer.getDisplayLayer(params.displayLayerId)
+        @displayLayer.reset(displayLayerParams)
+        @selectionsMarkerLayer = @displayLayer.getMarkerLayer(params.selectionsMarkerLayerId)
+      else
+        @displayLayer = @buffer.addDisplayLayer(displayLayerParams)
 
     @backgroundWorkHandle = requestIdleCallback(@doBackgroundWork)
     @disposables.add new Disposable =>