Disable markdown commands when in markdown cells in notebooks

Fixes #101514

extensions/markdown-language-features/package.json

@@ -78,7 +78,7 @@
 			"editor/title": [
 				{
 					"command": "markdown.showPreviewToSide",
-					"when": "editorLangId == markdown",
+					"when": "editorLangId == markdown && !notebookEditorFocused",
 					"alt": "markdown.showPreview",
 					"group": "navigation"
 				},
@@ -120,17 +120,17 @@
 			"commandPalette": [
 				{
 					"command": "markdown.showPreview",
-					"when": "editorLangId == markdown",
+					"when": "editorLangId == markdown && !notebookEditorFocused",
 					"group": "navigation"
 				},
 				{
 					"command": "markdown.showPreviewToSide",
-					"when": "editorLangId == markdown",
+					"when": "editorLangId == markdown && !notebookEditorFocused",
 					"group": "navigation"
 				},
 				{
 					"command": "markdown.showLockedPreviewToSide",
-					"when": "editorLangId == markdown",
+					"when": "editorLangId == markdown && !notebookEditorFocused",
 					"group": "navigation"
 				},
 				{
@@ -140,7 +140,7 @@
 				},
 				{
 					"command": "markdown.showPreviewSecuritySelector",
-					"when": "editorLangId == markdown"
+					"when": "editorLangId == markdown && !notebookEditorFocused"
 				},
 				{
 					"command": "markdown.showPreviewSecuritySelector",
@@ -152,7 +152,7 @@
 				},
 				{
 					"command": "markdown.preview.refresh",
-					"when": "editorLangId == markdown"
+					"when": "editorLangId == markdown && !notebookEditorFocused"
 				},
 				{
 					"command": "markdown.preview.refresh",
@@ -165,13 +165,13 @@
 				"command": "markdown.showPreview",
 				"key": "shift+ctrl+v",
 				"mac": "shift+cmd+v",
-				"when": "editorLangId == markdown"
+				"when": "editorLangId == markdown && !notebookEditorFocused"
 			},
 			{
 				"command": "markdown.showPreviewToSide",
 				"key": "ctrl+k v",
 				"mac": "cmd+k v",
-				"when": "editorLangId == markdown"
+				"when": "editorLangId == markdown && !notebookEditorFocused"
 			}
 		],
 		"configuration": {

extensions/markdown-language-features/src/features/preview.ts

@@ -612,7 +612,12 @@ export class DynamicMarkdownPreview extends Disposable implements ManagedMarkdow
 		}));
 
 		this._register(vscode.window.onDidChangeActiveTextEditor(editor => {
-			if (editor && isMarkdownFile(editor.document) && !this._locked && !this._preview.isPreviewOf(editor.document.uri)) {
+			// Only allow previewing normal text editors which have a viewColumn: See #101514
+			if (typeof editor?.viewColumn === 'undefined') {
+				return;
+			}
+
+			if (isMarkdownFile(editor.document) && !this._locked && !this._preview.isPreviewOf(editor.document.uri)) {
 				const line = getVisibleLine(editor);
 				this.update(editor.document.uri, line ? new StartingScrollLine(line) : undefined);
 			}