Add create new branch option (create worktree) (microsoft#259599)

* add create branch option on current branch

* fix override

Author: nguyenchristy

extensions/git/src/commands.ts

@@ -3480,15 +3480,32 @@ export class CommandCenter {
 				return;
 			}
 
-			// Check whether the selected branch is checked out in an existing worktree
-			const worktree = repository.worktrees.find(worktree => worktree.ref === choice.refId);
-			if (worktree) {
-				const message = l10n.t('Branch "{0}" is already checked out in the worktree at "{1}".', choice.refName, worktree.path);
-				await this.handleWorktreeConflict(worktree.path, message);
-				return;
-			}
+			if (choice.refName === repository.HEAD?.name) {
+				const message = l10n.t('Branch "{0}" is already checked out in the current repository.', choice.refName);
+				const createBranch = l10n.t('Create New Branch');
+				const pick = await window.showWarningMessage(message, { modal: true }, createBranch);
+
+				if (pick === createBranch) {
+					branch = await this.promptForBranchName(repository);
 
-			commitish = choice.refName;
+					if (!branch) {
+						return;
+					}
+
+					commitish = 'HEAD';
+				} else {
+					return;
+				}
+			} else {
+				// Check whether the selected branch is checked out in an existing worktree
+				const worktree = repository.worktrees.find(worktree => worktree.ref === choice.refId);
+				if (worktree) {
+					const message = l10n.t('Branch "{0}" is already checked out in the worktree at "{1}".', choice.refName, worktree.path);
+					await this.handleWorktreeConflict(worktree.path, message);
+					return;
+				}
+				commitish = choice.refName;
+			}
 		}
 
 		const worktreeName = ((branch ?? commitish).startsWith(branchPrefix)