polish for supporting markdown hybrid find in notebook search (microsoft#182776)

* fix default notebook search filters

* save state on markdown preview toggle

Author: andreamah

src/vs/workbench/contrib/search/browser/searchFindInput.ts

@@ -63,7 +63,7 @@ export class SearchFindInput extends ContextScopedFindInput {
 		// filter is checked if it's in a non-default state
 		this._filterChecked =
 			!this.filters.markupInput ||
-			this.filters.markupPreview ||
+			!this.filters.markupPreview ||
 			!this.filters.codeInput ||
 			!this.filters.codeOutput;
 

src/vs/workbench/contrib/search/browser/searchView.ts

@@ -2010,13 +2010,15 @@ export class SearchView extends ViewPane {
 			const isInNotebookCellInput = this.searchWidget.getNotebookFilters().codeInput;
 			const isInNotebookCellOutput = this.searchWidget.getNotebookFilters().codeOutput;
 			const isInNotebookMarkdownInput = this.searchWidget.getNotebookFilters().markupInput;
+			const isInNotebookMarkdownPreview = this.searchWidget.getNotebookFilters().markupPreview;
 
 			this.viewletState['query.contentPattern'] = contentPattern;
 			this.viewletState['query.regex'] = isRegex;
 			this.viewletState['query.wholeWords'] = isWholeWords;
 			this.viewletState['query.caseSensitive'] = isCaseSensitive;
 
 			this.viewletState['query.isInNotebookMarkdownInput'] = isInNotebookMarkdownInput;
+			this.viewletState['query.isInNotebookMarkdownPreview'] = isInNotebookMarkdownPreview;
 			this.viewletState['query.isInNotebookCellInput'] = isInNotebookCellInput;
 			this.viewletState['query.isInNotebookCellOutput'] = isInNotebookCellOutput;
 		}