keys/views: Add mapping of contexts to broader contexts they belong to.

Update the contextual help menu to use the parent contexts as well.
Add linting for parent contexts mapping.

tools/lint-hotkeys

@@ -12,6 +12,7 @@ from zulipterminal.config.keys import (
     HELP_CATEGORIES,
     HELP_CONTEXTS,
     KEY_BINDINGS,
+    PARENT_CONTEXTS,
     display_keys_for_command,
 )
 
@@ -93,6 +94,7 @@ def lint_hotkeys_file() -> None:
     error_flag |= lint_help_groups("category")
     error_flag |= lint_help_groups("context")
     error_flag |= lint_help_text()
+    error_flag |= lint_parent_contexts()
 
     if error_flag:
         print(f"Rerun this command after resolving errors in config/{KEYS_FILE_NAME}")
@@ -178,6 +180,38 @@ def lint_help_groups(group: Group) -> bool:
     return error_flag
 
 
+def lint_parent_contexts() -> bool:
+    """
+    Lint for any typos in the PARENT_CONTEXTS dict
+    """
+    key_typos = []
+    value_typos = []
+
+    for key, value_list in PARENT_CONTEXTS.items():
+        if key not in HELP_CONTEXTS:
+            key_typos.append(key)
+        for value in value_list:
+            if value not in HELP_CONTEXTS:
+                value_typos.append(value)
+
+    error_message = ""
+    if key_typos:
+        error_message += (
+            f"Invalid contexts in parent context keys: {', '.join(key_typos)}.\n"
+        )
+    if value_typos:
+        error_message += (
+            f"Invalid contexts in parent context values: {', '.join(value_typos)}.\n"
+        )
+
+    if error_message:
+        error_message += f" Choose a context from:\n{', '.join(HELP_CONTEXTS.keys())}\n"
+        print(error_message)
+        return True
+
+    return False
+
+
 def generate_hotkeys_file(group: Group) -> None:
     """
     Generate output file based on help text description and

zulipterminal/config/keys.py

@@ -563,6 +563,24 @@ class KeyBinding(TypedDict):
     "search_box": "Search box",
 }
 
+PARENT_CONTEXTS: Dict[str, List[str]] = {
+    "global": [],
+    "general": ["global"],
+    "editor": ["global"],
+    "compose_box": ["editor", "global"],
+    "stream": ["general", "global", "button"],
+    "topic": ["general", "global", "button"],
+    "user": ["general", "global", "button"],
+    "message": ["general", "global"],
+    "stream_info": ["global", "popup"],
+    "msg_info": ["global", "popup"],
+    "emoji_list": ["global", "popup"],
+    "about": ["global", "popup"],
+    "search_box": ["global", "editor"],
+    "popup": ["global"],
+    "button": ["global"],
+}
+
 ZT_TO_URWID_CMD_MAPPING = {
     "GO_UP": CURSOR_UP,
     "GO_DOWN": CURSOR_DOWN,

zulipterminal/ui_tools/views.py

@@ -14,6 +14,7 @@
 from zulipterminal.config.keys import (
     HELP_CATEGORIES,
     KEY_BINDINGS,
+    PARENT_CONTEXTS,
     display_key_for_urwid_key,
     display_keys_for_command,
     is_command_key,
@@ -1240,12 +1241,17 @@ def __init__(
         self, controller: Any, title: str, context: Optional[str] = None
     ) -> None:
         help_menu_content = []
+        if context:
+            valid_contexts = PARENT_CONTEXTS[context] + [context]
         for category in HELP_CATEGORIES:
             keys_in_category = (
                 binding
                 for binding in KEY_BINDINGS.values()
                 if binding["key_category"] == category
-                and (not context or context in binding["key_contexts"])
+                and (
+                    not context
+                    or bool(set(binding["key_contexts"]) & set(valid_contexts))
+                )
             )
             key_bindings = [
                 (