Simplify some sequences that seem unique to rxvt

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
  - `link-hover-background` renamed to `link-background-hover`
  - `link-hover-color` renamed to `link-color-hover`
  - `link-hover-style` renamed to `link-style-hover`
+- Brought rxvt's use of shift-numpad keys in line with most other terminals https://github.com/Textualize/textual/pull/3769
 
 ### Added
 

src/textual/_ansi_sequences.py

@@ -1,9 +1,11 @@
+from __future__ import annotations
+
 from typing import Mapping, Tuple
 
 from .keys import Keys
 
 # Mapping of vt100 escape codes to Keys.
-ANSI_SEQUENCES_KEYS: Mapping[str, Tuple[Keys, ...]] = {
+ANSI_SEQUENCES_KEYS: Mapping[str, Tuple[Keys, ...] | str] = {
     # Control keys.
     " ": (Keys.Space,),
     "\r": (Keys.Enter,),
@@ -350,6 +352,24 @@
     "\x1b[1;8w": (Keys.Escape, Keys.ControlShift7),
     "\x1b[1;8x": (Keys.Escape, Keys.ControlShift8),
     "\x1b[1;8y": (Keys.Escape, Keys.ControlShift9),
+    # Simplify some sequences that appear to be unique to rxvt; see
+    # https://github.com/Textualize/textual/issues/3741 for context.
+    "\x1bOj": "*",
+    "\x1bOk": "+",
+    "\x1bOm": "-",
+    "\x1bOn": ".",
+    "\x1bOo": "/",
+    "\x1bOp": "0",
+    "\x1bOq": "1",
+    "\x1bOr": "2",
+    "\x1bOs": "3",
+    "\x1bOt": "4",
+    "\x1bOu": "5",
+    "\x1bOv": "6",
+    "\x1bOw": "7",
+    "\x1bOx": "8",
+    "\x1bOy": "9",
+    "\x1bOM": (Keys.Enter,),
 }
 
 # https://gist.github.com/christianparpart/d8a62cc1ab659194337d73e399004036

src/textual/_xterm_parser.py

@@ -243,10 +243,20 @@ def _sequence_to_key_events(
             Keys
         """
         keys = ANSI_SEQUENCES_KEYS.get(sequence)
-        if keys is not None:
+        if isinstance(keys, tuple):
+            # If the sequence mapped to a tuple, then it's values from the
+            # `Keys` enum. Raise key events from what we find in the tuple.
             for key in keys:
                 yield events.Key(key.value, sequence if len(sequence) == 1 else None)
-        elif len(sequence) == 1:
+            return
+        # If keys is a string, the intention is that it's a mapping to a
+        # character, which should really be treated as the sequence for the
+        # purposes of the next step...
+        if isinstance(keys, str):
+            sequence = keys
+        # If the sequence is a single character, attempt to process it as a
+        # key.
+        if len(sequence) == 1:
             try:
                 if not sequence.isalnum():
                     name = _character_to_key(sequence)