!squash fix: rename _global to global_ in OptionsMixin

why: Python convention uses trailing underscore (global_) to avoid
conflicts with reserved words, not leading underscore (_global).

what:
- Rename _global parameter to global_ across all methods
- Update deprecation warning message to reference global_
- Update docstring reference to global_

Author: tony

src/libtmux/options.py

@@ -600,7 +600,7 @@ def set_option(
 
         .. deprecated:: 0.28
 
-           Deprecated by ``g`` for global, use `_global`` instead.
+           Deprecated by ``g`` for global, use `global_`` instead.
 
         Raises
         ------
@@ -667,7 +667,7 @@ def set_option(
             flags.append("-a")
 
         if g is not None:
-            warnings.warn("g argument is deprecated in favor of _global", stacklevel=2)
+            warnings.warn("g argument is deprecated in favor of global_", stacklevel=2)
             global_ = g
 
         if global_ is not None and global_:
@@ -696,7 +696,7 @@ def unset_option(
         self,
         option: str,
         unset_panes: bool | None = None,
-        _global: bool | None = None,
+        global_: bool | None = None,
         ignore_errors: bool | None = None,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
     ) -> Self:
@@ -758,8 +758,8 @@ def unset_option(
             assert isinstance(ignore_errors, bool)
             flags.append("-q")
 
-        if _global is not None and _global:
-            assert isinstance(_global, bool)
+        if global_ is not None and global_:
+            assert isinstance(global_, bool)
             flags.append("-g")
 
         if scope is not None and not isinstance(scope, _DefaultOptionScope):
@@ -782,7 +782,7 @@ def unset_option(
     def _show_options_raw(
         self,
         g: bool | None = False,
-        _global: bool | None = False,
+        global_: bool | None = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         include_hooks: bool | None = None,
         include_inherited: bool | None = None,
@@ -823,9 +823,9 @@ def _show_options_raw(
         flags: tuple[str, ...] = ()
 
         if g:
-            warnings.warn("g argument is deprecated in favor of _global", stacklevel=2)
+            warnings.warn("g argument is deprecated in favor of global_", stacklevel=2)
             flags += ("-g",)
-        elif _global:
+        elif global_:
             flags += ("-g",)
 
         if scope is not None and not isinstance(scope, _DefaultOptionScope):
@@ -843,7 +843,7 @@ def _show_options_raw(
     def _show_options_dict(
         self,
         g: bool | None = False,
-        _global: bool | None = False,
+        global_: bool | None = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         include_hooks: bool | None = None,
         include_inherited: bool | None = None,
@@ -879,7 +879,7 @@ def _show_options_dict(
         True
         """
         cmd = self._show_options_raw(
-            _global=_global,
+            global_=global_,
             scope=scope,
             include_hooks=include_hooks,
             include_inherited=include_inherited,
@@ -892,7 +892,7 @@ def _show_options_dict(
     def _show_options(
         self,
         g: bool | None = False,
-        _global: bool | None = False,
+        global_: bool | None = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         include_hooks: bool | None = None,
         include_inherited: bool | None = None,
@@ -925,7 +925,7 @@ def _show_options(
         {...}
         """
         dict_output = self._show_options_dict(
-            _global=_global,
+            global_=global_,
             scope=scope,
             include_hooks=include_hooks,
             include_inherited=include_inherited,
@@ -942,7 +942,7 @@ def _show_options(
     def _show_option_raw(
         self,
         option: str,
-        _global: bool = False,
+        global_: bool = False,
         g: bool = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         ignore_errors: bool | None = None,
@@ -982,16 +982,16 @@ def _show_option_raw(
         >>> MyServer().cmd('new-session', '-d')
         <libtmux.common.tmux_cmd object at ...>
 
-        >>> MyServer()._show_option_raw('exit-unattached', _global=True)
+        >>> MyServer()._show_option_raw('exit-unattached', global_=True)
         <libtmux.common.tmux_cmd object at ...>
 
-        >>> MyServer()._show_option_raw('exit-unattached', _global=True).stdout
+        >>> MyServer()._show_option_raw('exit-unattached', global_=True).stdout
         ['exit-unattached off']
 
-        >>> isinstance(MyServer()._show_option_raw('exit-unattached', _global=True).stdout, list)
+        >>> isinstance(MyServer()._show_option_raw('exit-unattached', global_=True).stdout, list)
         True
 
-        >>> isinstance(MyServer()._show_option_raw('exit-unattached', _global=True).stdout[0], str)
+        >>> isinstance(MyServer()._show_option_raw('exit-unattached', global_=True).stdout[0], str)
         True
         """
         if scope is DEFAULT_OPTION_SCOPE:
@@ -1000,9 +1000,9 @@ def _show_option_raw(
         flags: tuple[str | int, ...] = ()
 
         if g:
-            warnings.warn("g argument is deprecated in favor of _global", stacklevel=2)
+            warnings.warn("g argument is deprecated in favor of global_", stacklevel=2)
             flags += ("-g",)
-        elif _global:
+        elif global_:
             flags += ("-g",)
 
         if scope is not None and not isinstance(scope, _DefaultOptionScope):
@@ -1025,7 +1025,7 @@ def _show_option_raw(
     def _show_option(
         self,
         option: str,
-        _global: bool = False,
+        global_: bool = False,
         g: bool = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         ignore_errors: bool | None = None,
@@ -1067,12 +1067,12 @@ def _show_option(
         >>> MyServer().cmd('new-session', '-d')
         <libtmux.common.tmux_cmd object at ...>
 
-        >>> MyServer()._show_option('exit-unattached', _global=True)
+        >>> MyServer()._show_option('exit-unattached', global_=True)
         False
         """
         cmd = self._show_option_raw(
             option=option,
-            _global=_global,
+            global_=global_,
             scope=scope,
             ignore_errors=ignore_errors,
             include_hooks=include_hooks,
@@ -1115,7 +1115,7 @@ def _show_option(
     def show_option(
         self,
         option: str,
-        _global: bool = False,
+        global_: bool = False,
         g: bool = False,
         scope: OptionScope | _DefaultOptionScope | None = DEFAULT_OPTION_SCOPE,
         ignore_errors: bool | None = None,
@@ -1155,12 +1155,12 @@ def show_option(
         >>> MyServer().cmd('new-session', '-d')
         <libtmux.common.tmux_cmd object at ...>
 
-        >>> MyServer().show_option('exit-unattached', _global=True)
+        >>> MyServer().show_option('exit-unattached', global_=True)
         False
         """
         return self._show_option(
             option=option,
-            _global=_global,
+            global_=global_,
             scope=scope,
             ignore_errors=ignore_errors,
             include_hooks=include_hooks,