Iterate on paste edit provider api (#151477)

* Iterate on paste edit provider api

For #30066

- Pass all selections to paste providers. For #151326
- Introduce `DocumentPasteEdit` as return type. This new type uses an `insertText` that is applied to every paste location (for multicursor), plus an optional additional edit
-  Add `DocumentPasteProviderMetadata`. This lets extensions tell us which types of mimetypes they are interested in, letting us avoid round trips if no extensions care about the pasted data

* Correctly batch insertText

2 files changed, 18 insertions, 8 deletions

diff --git a/extensions/markdown-language-features/src/languageFeatures/copyPaste.ts b/extensions/markdown-language-features/src/languageFeatures/copyPaste.ts
index d9e939b463c..c36403d06ee 100644
--- a/extensions/markdown-language-features/src/languageFeatures/copyPaste.ts
+++ b/extensions/markdown-language-features/src/languageFeatures/copyPaste.ts
@@ -4,23 +4,29 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { tryInsertUriList } from './dropIntoEditor';
+import { tryGetUriListSnippet } from './dropIntoEditor';
 
 export function registerPasteProvider(selector: vscode.DocumentSelector) {
 	return vscode.languages.registerDocumentPasteEditProvider(selector, new class implements vscode.DocumentPasteEditProvider {
 
 		async provideDocumentPasteEdits(
 			document: vscode.TextDocument,
-			range: vscode.Range,
+			_ranges: readonly vscode.Range[],
 			dataTransfer: vscode.DataTransfer,
 			token: vscode.CancellationToken,
-		): Promise<vscode.SnippetTextEdit | undefined> {
+		): Promise<vscode.DocumentPasteEdit | undefined> {
 			const enabled = vscode.workspace.getConfiguration('markdown', document).get('experimental.editor.pasteLinks.enabled', false);
 			if (!enabled) {
 				return;
 			}
 
-			return tryInsertUriList(document, range, dataTransfer, token);
+			const snippet = await tryGetUriListSnippet(document, dataTransfer, token);
+			if (snippet) {
+				return { insertText: snippet };
+			}
+			return undefined;
 		}
+	}, {
+		pasteMimeTypes: ['text/uri-list']
 	});
 }
diff --git a/extensions/markdown-language-features/src/languageFeatures/dropIntoEditor.ts b/extensions/markdown-language-features/src/languageFeatures/dropIntoEditor.ts
index 2ad71ec0516..b451ea40a4e 100644
--- a/extensions/markdown-language-features/src/languageFeatures/dropIntoEditor.ts
+++ b/extensions/markdown-language-features/src/languageFeatures/dropIntoEditor.ts
@@ -28,16 +28,20 @@ export function registerDropIntoEditor(selector: vscode.DocumentSelector) {
 		async provideDocumentOnDropEdits(document: vscode.TextDocument, position: vscode.Position, dataTransfer: vscode.DataTransfer, token: vscode.CancellationToken): Promise<vscode.SnippetTextEdit | undefined> {
 			const enabled = vscode.workspace.getConfiguration('markdown', document).get('editor.drop.enabled', true);
 			if (!enabled) {
-				return;
+				return undefined;
 			}
 
 			const replacementRange = new vscode.Range(position, position);
-			return tryInsertUriList(document, replacementRange, dataTransfer, token);
+			const snippet = await tryGetUriListSnippet(document, dataTransfer, token);
+			if (snippet) {
+				return new vscode.SnippetTextEdit(replacementRange, snippet);
+			}
+			return undefined;
 		}
 	});
 }
 
-export async function tryInsertUriList(document: vscode.TextDocument, replacementRange: vscode.Range, dataTransfer: vscode.DataTransfer, token: vscode.CancellationToken): Promise<vscode.SnippetTextEdit | undefined> {
+export async function tryGetUriListSnippet(document: vscode.TextDocument, dataTransfer: vscode.DataTransfer, token: vscode.CancellationToken): Promise<vscode.SnippetString | undefined> {
 	const urlList = await dataTransfer.get('text/uri-list')?.asString();
 	if (!urlList || token.isCancellationRequested) {
 		return undefined;
@@ -72,5 +76,5 @@ export async function tryInsertUriList(document: vscode.TextDocument, replacemen
 		}
 	});
 
-	return new vscode.SnippetTextEdit(replacementRange, snippet);
+	return snippet;
 }