cli: fix Ubuntu white-on-white model autocomplete by merging default prompt_toolkit UI style (#10347)

openhands/cli/pt_style.py

@@ -0,0 +1,26 @@
+from prompt_toolkit.styles import Style, merge_styles
+from prompt_toolkit.styles.defaults import default_ui_style
+
+# Centralized helper for CLI styles so we can safely merge our custom colors
+# with prompt_toolkit's default UI style. This preserves completion menu and
+# fuzzy-match visibility across different terminal themes (e.g., Ubuntu).
+
+COLOR_GOLD = '#FFD700'
+COLOR_GREY = '#808080'
+COLOR_AGENT_BLUE = '#4682B4'  # Steel blue - readable on light/dark backgrounds
+
+
+def get_cli_style() -> Style:
+    base = default_ui_style()
+    custom = Style.from_dict(
+        {
+            'gold': COLOR_GOLD,
+            'grey': COLOR_GREY,
+            'prompt': f'{COLOR_GOLD} bold',
+            # Ensure good contrast for fuzzy matches on the selected completion row
+            # across terminals/themes (e.g., Ubuntu GNOME, Alacritty, Kitty).
+            # See https://github.com/All-Hands-AI/OpenHands/issues/10330
+            'completion-menu.completion.current fuzzymatch.outside': 'fg:#ffffff bg:#888888',
+        }
+    )
+    return merge_styles([base, custom])

openhands/cli/settings.py

@@ -8,8 +8,8 @@ from prompt_toolkit.shortcuts import print_container
 from prompt_toolkit.widgets import Frame, TextArea
 from pydantic import SecretStr
 
+from openhands.cli.pt_style import COLOR_GREY, get_cli_style
 from openhands.cli.tui import (
-    COLOR_GREY,
     UserCancelledError,
     cli_confirm,
     kb_cancel,
@@ -242,7 +242,7 @@ async def modify_llm_settings_basic(
     provider_list = verified_providers + provider_list
 
     provider_completer = FuzzyWordCompleter(provider_list, WORD=True)
-    session = PromptSession(key_bindings=kb_cancel())
+    session = PromptSession(key_bindings=kb_cancel(), style=get_cli_style())
 
     current_provider, current_model, current_api_key = (
         _get_current_values_for_modification_basic(config)
@@ -490,7 +490,7 @@ async def modify_llm_settings_basic(
 async def modify_llm_settings_advanced(
     config: OpenHandsConfig, settings_store: FileSettingsStore
 ) -> None:
-    session = PromptSession(key_bindings=kb_cancel())
+    session = PromptSession(key_bindings=kb_cancel(), style=get_cli_style())
     llm_config = config.get_llm_config()
 
     custom_model = None
@@ -621,7 +621,7 @@ async def modify_search_api_settings(
     config: OpenHandsConfig, settings_store: FileSettingsStore
 ) -> None:
     """Modify search API settings."""
-    session = PromptSession(key_bindings=kb_cancel())
+    session = PromptSession(key_bindings=kb_cancel(), style=get_cli_style())
 
     search_api_key = None
 

openhands/cli/tui.py

@@ -31,6 +31,12 @@ from prompt_toolkit.styles import Style
 from prompt_toolkit.widgets import Frame, TextArea
 
 from openhands import __version__
+from openhands.cli.pt_style import (
+    COLOR_AGENT_BLUE,
+    COLOR_GOLD,
+    COLOR_GREY,
+    get_cli_style,
+)
 from openhands.core.config import OpenHandsConfig
 from openhands.core.schema import AgentState
 from openhands.events import EventSource, EventStream
@@ -66,16 +72,7 @@ recent_thoughts: list[str] = []
 MAX_RECENT_THOUGHTS = 5
 
 # Color and styling constants
-COLOR_GOLD = '#FFD700'
-COLOR_GREY = '#808080'
-COLOR_AGENT_BLUE = '#4682B4'  # Steel blue - less saturated, works well on both light and dark backgrounds
-DEFAULT_STYLE = Style.from_dict(
-    {
-        'gold': COLOR_GOLD,
-        'grey': COLOR_GREY,
-        'prompt': f'{COLOR_GOLD} bold',
-    }
-)
+DEFAULT_STYLE = get_cli_style()
 
 COMMANDS = {
     '/exit': 'Exit the application',