Fix: Include staged changes in the git selector

Author: themisvaltinos

docs/guides/model_selection.md

@@ -242,8 +242,9 @@ Models:
 #### Select with git changes
 
 The git-based selector allows you to select models whose files have changed compared to a target branch (default: main). This includes:
+
 - Untracked files (new files not in git)
-- Uncommitted changes in working directory
+- Uncommitted changes in working directory (both staged and unstaged)
 - Committed changes different from the target branch
 
 For example:

sqlmesh/utils/git.py

@@ -16,7 +16,9 @@ def list_untracked_files(self) -> t.List[Path]:
         )
 
     def list_uncommitted_changed_files(self) -> t.List[Path]:
-        return self._execute_list_output(["diff", "--name-only", "--diff-filter=d"], self._git_root)
+        return self._execute_list_output(
+            ["diff", "--name-only", "--diff-filter=d", "HEAD"], self._git_root
+        )
 
     def list_committed_changed_files(self, target_branch: str = "main") -> t.List[Path]:
         return self._execute_list_output(