Fix: exclude hidden directories when drag-dropping folders into virtualTabs panel

[Copilot]

When dragging a folder from VS Code's native tree view into the virtualTabs panel, hidden directories (.git, .github, etc.) were recursively included — inconsistent with how VS Code's explorer displays file trees.

Changes

• src/dragAndDrop.ts — Added a guard in getFilesInDirectoryRecursive to skip directories whose names start with '.'. Hidden files (e.g. .gitignore, .editorconfig) are still included, matching VS Code's native explorer behaviour which only excludes hidden folders like .git by default:

  // Skip hidden directories (names starting with '.') such as .git, .github
  // Hidden files (e.g. .gitignore, .editorconfig) are still included.
  if (name.startsWith('.')) {
      continue;
  }

• src/test/unit/dragAndDropHiddenFiles.test.ts — Unit tests covering: hidden directories are excluded, hidden files (.gitignore, .editorconfig) are retained, nested children of hidden dirs are excluded, normal files are unaffected, and edge cases (empty dir, dir containing only hidden entries).

[winterdrive]

@copilot 應該是只忽略 “.” 開頭的folder，而非連檔案也要忽略，這樣會導致.gitignore或其他可用檔案直接被忽略。我的理解是否正確，請正反兩面評價。

[Copilot]

@copilot 應該是只忽略 “.” 開頭的folder，而非連檔案也要忽略，這樣會導致.gitignore或其他可用檔案直接被忽略。我的理解是否正確，請正反兩面評價。

你的理解是正確的。以下是兩面評估：

只忽略隱藏資料夾（建議採用）

• VS Code 原生 explorer 預設只排除 .git 資料夾（透過 files.exclude），不會隱藏 .gitignore、.editorconfig、.eslintrc 等常見 dotfile
• 使用者拖曳專案時，可能需要將這些設定檔加入面板，不應被靜默排除

同時忽略隱藏檔案與資料夾

• 規則更簡單一致
• 缺點：會意外排除使用者可能需要的檔案

已在 5f95c41 將過濾條件改為僅跳過以 . 開頭的資料夾（.git、.github 等），隱藏檔案（.gitignore、.editorconfig 等）仍會正常納入。