Cherry-pick upstream dbcli#1558: cursor shape indicator for vi mode

Author: DiegoDAF

changelog.rst

@@ -7,6 +7,8 @@ Features:
 * Drop Python 3.9 support (EOL October 2025). Minimum version is now 3.10.
 * Update CI: PostgreSQL 10 → 16, fix duplicate checkout step.
 * Suppress timezone message in non-interactive mode (``-c``, ``-f``).
+* Add cursor shape support for vi mode: beam in INSERT, block in NORMAL,
+  underline in REPLACE. Uses ``ModalCursorShapeConfig`` (upstream #1558).
 
 Bug Fixes:
 ----------

pgcli/main.py

@@ -48,6 +48,7 @@
 )
 from prompt_toolkit.history import FileHistory
 from prompt_toolkit.auto_suggest import AutoSuggestFromHistory
+from prompt_toolkit.cursor_shapes import ModalCursorShapeConfig
 from pygments.lexers.sql import PostgresLexer
 
 from pgspecial.main import PGSpecial, NO_QUERY, PAGER_OFF, PAGER_LONG_OUTPUT
@@ -1271,6 +1272,7 @@ def get_continuation(width, line_number, is_soft_wrap):
                 enable_suspend=True,
                 editing_mode=EditingMode.VI if self.vi_mode else EditingMode.EMACS,
                 search_ignore_case=True,
+                cursor=ModalCursorShapeConfig(),
             )
 
             return prompt_app