Make background cell color peekview (microsoft#5378)

Author: rchiodo

news/2 Fixes/5236.md

@@ -0,0 +1 @@
+Make background cell color useable in all themes.

src/client/datascience/editor-integration/decorator.ts

@@ -22,11 +22,11 @@ export class Decorator implements IExtensionActivationService, IDisposable {
  @inject(IConfigurationService) private configuration: IConfigurationService)
  {
  this.activeCellType = this.documentManager.createTextEditorDecorationType({
- backgroundColor: new vscode.ThemeColor('sideBarSectionHeader.background'),
+ backgroundColor: new vscode.ThemeColor('peekViewEditor.background'),
  isWholeLine: true
  });
  this.cellSeparatorType = this.documentManager.createTextEditorDecorationType({
- borderColor: new vscode.ThemeColor('sideBarSectionHeader.background'),
+ borderColor: new vscode.ThemeColor('peekViewEditor.background'),
  borderWidth: '1px 0px 0px 0px',
  borderStyle: 'solid',
  isWholeLine: true