diff --git a/src/vs/editor/common/model/mirrorTextModel.ts b/src/vs/editor/common/model/mirrorTextModel.ts
index a6f02048da2..92aee2d0d93 100644
--- a/src/vs/editor/common/model/mirrorTextModel.ts
+++ b/src/vs/editor/common/model/mirrorTextModel.ts
@@ -8,7 +8,7 @@ import { URI } from 'vs/base/common/uri';
 import { Position } from 'vs/editor/common/core/position';
 import { IRange } from 'vs/editor/common/core/range';
 import { IModelContentChange } from 'vs/editor/common/model/textModelEvents';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 
 export interface IModelChangedEvent {
 	/**
diff --git a/src/vs/editor/common/viewModel/prefixSumComputer.ts b/src/vs/editor/common/model/prefixSumComputer.ts
similarity index 100%
rename from src/vs/editor/common/viewModel/prefixSumComputer.ts
rename to src/vs/editor/common/model/prefixSumComputer.ts
diff --git a/src/vs/editor/common/viewModel/viewModelLines.ts b/src/vs/editor/common/viewModel/viewModelLines.ts
index d578acab370..eeaf05d32de 100644
--- a/src/vs/editor/common/viewModel/viewModelLines.ts
+++ b/src/vs/editor/common/viewModel/viewModelLines.ts
@@ -16,7 +16,7 @@ import { LineInjectedText } from 'vs/editor/common/model/textModelEvents';
 import * as viewEvents from 'vs/editor/common/view/viewEvents';
 import { createModelLineProjection, IModelLineProjection } from 'vs/editor/common/viewModel/modelLineProjection';
 import { ILineBreaksComputer, ModelLineProjectionData, InjectedText, ILineBreaksComputerFactory } from 'vs/editor/common/viewModel/modelLineProjectionData';
-import { ConstantTimePrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { ConstantTimePrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { ICoordinatesConverter, ViewLineData } from 'vs/editor/common/viewModel/viewModel';
 
 export interface IViewModelLines extends IDisposable {
diff --git a/src/vs/editor/test/common/viewModel/prefixSumComputer.test.ts b/src/vs/editor/test/common/viewModel/prefixSumComputer.test.ts
index b1271a5ce76..a0dcd9d76b1 100644
--- a/src/vs/editor/test/common/viewModel/prefixSumComputer.test.ts
+++ b/src/vs/editor/test/common/viewModel/prefixSumComputer.test.ts
@@ -5,7 +5,7 @@
 
 import * as assert from 'assert';
 import { toUint32 } from 'vs/base/common/uint';
-import { PrefixSumComputer, PrefixSumIndexOfResult } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer, PrefixSumIndexOfResult } from 'vs/editor/common/model/prefixSumComputer';
 
 function toUint32Array(arr: number[]): Uint32Array {
 	const len = arr.length;
diff --git a/src/vs/workbench/api/common/extHostNotebookConcatDocument.ts b/src/vs/workbench/api/common/extHostNotebookConcatDocument.ts
index d92dfc8b9e6..7116bbd8d39 100644
--- a/src/vs/workbench/api/common/extHostNotebookConcatDocument.ts
+++ b/src/vs/workbench/api/common/extHostNotebookConcatDocument.ts
@@ -8,7 +8,7 @@ import * as vscode from 'vscode';
 import { Event, Emitter } from 'vs/base/common/event';
 import { ExtHostNotebookController } from 'vs/workbench/api/common/extHostNotebook';
 import { ExtHostDocuments } from 'vs/workbench/api/common/extHostDocuments';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { DisposableStore } from 'vs/base/common/lifecycle';
 import { score } from 'vs/editor/common/languages/languageSelector';
 import { ResourceMap } from 'vs/base/common/map';
diff --git a/src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts b/src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts
index 9e3ea4dcde4..354a698060f 100644
--- a/src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts
+++ b/src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts
@@ -10,7 +10,7 @@ import { FindDecorations } from 'vs/editor/contrib/find/browser/findDecorations'
 import { ModelDecorationOptions } from 'vs/editor/common/model/textModel';
 import { FindMatch, IModelDeltaDecoration } from 'vs/editor/common/model';
 import { ICellModelDeltaDecorations, ICellModelDecorations } from 'vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { FindReplaceState } from 'vs/editor/contrib/find/browser/findState';
 import { CellKind, INotebookSearchOptions, NotebookCellsChangeType } from 'vs/workbench/contrib/notebook/common/notebookCommon';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
diff --git a/src/vs/workbench/contrib/notebook/browser/diff/diffNestedCellViewModel.ts b/src/vs/workbench/contrib/notebook/browser/diff/diffNestedCellViewModel.ts
index 771b9a3c060..8f7048048aa 100644
--- a/src/vs/workbench/contrib/notebook/browser/diff/diffNestedCellViewModel.ts
+++ b/src/vs/workbench/contrib/notebook/browser/diff/diffNestedCellViewModel.ts
@@ -6,7 +6,7 @@
 import { Emitter } from 'vs/base/common/event';
 import { Disposable } from 'vs/base/common/lifecycle';
 import { generateUuid } from 'vs/base/common/uuid';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { IDiffNestedCellViewModel } from 'vs/workbench/contrib/notebook/browser/diff/notebookDiffEditorBrowser';
 import { CellViewModelStateChangeEvent, ICellOutputViewModel, IGenericCellViewModel } from 'vs/workbench/contrib/notebook/browser/notebookBrowser';
 import { CellOutputViewModel } from 'vs/workbench/contrib/notebook/browser/viewModel/cellOutputViewModel';
diff --git a/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts b/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
index 85e2bf04105..ad28acb8dd3 100644
--- a/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
+++ b/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
@@ -13,7 +13,7 @@ import { isMacintosh } from 'vs/base/common/platform';
 import { ScrollEvent } from 'vs/base/common/scrollable';
 import { Range } from 'vs/editor/common/core/range';
 import { TrackedRangeStickiness } from 'vs/editor/common/model';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
 import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
diff --git a/src/vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel.ts b/src/vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel.ts
index e61115a9115..e80b66b4063 100644
--- a/src/vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel.ts
+++ b/src/vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel.ts
@@ -9,7 +9,7 @@ import * as UUID from 'vs/base/common/uuid';
 import { ICodeEditorService } from 'vs/editor/browser/services/codeEditorService';
 import * as editorCommon from 'vs/editor/common/editorCommon';
 import { ITextModelService } from 'vs/editor/common/services/resolverService';
-import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
+import { PrefixSumComputer } from 'vs/editor/common/model/prefixSumComputer';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IUndoRedoService } from 'vs/platform/undoRedo/common/undoRedo';
 import { CellEditState, CellFindMatch, CodeCellLayoutChangeEvent, CodeCellLayoutInfo, CellLayoutState, ICellOutputViewModel, ICellViewModel, NotebookLayoutInfo } from 'vs/workbench/contrib/notebook/browser/notebookBrowser';