document added leading space in Pane.send_keys

Author: thomasballinger

doc/quickstart_python.rst

@@ -345,11 +345,13 @@ As long as you have the object, or are iterating through a list of them, you can
     >>> pane = window.split_window(attach=False)
     >>> pane.send_keys('echo hey', enter=False)
 
-See the other window, notice that :meth:`Pane.send_keys` has ``echo hey`` written,
-*still in the prompt*.
+See the other window, notice that :meth:`Pane.send_keys` has " ``echo hey``" written,
+*still in the prompt*. Note the leading space character so the command won't be added
+to the user's history. Use `pane.tmux('send-keys', text)` to send keys without this
+leading space.
 
 ``enter=False`` can be used to send keys without pressing return. In this case,
-you may  leave it to the user to press return themselves, or complete a command
+you may leave it to the user to press return themselves, or complete a command
 using :meth:`Pane.enter()`:
 
 .. code-block:: python

tmuxp/pane.py

@@ -75,6 +75,9 @@ def tmux(self, cmd, *args, **kwargs):
     def send_keys(self, cmd, enter=True):
         """``$ tmux send-keys`` to the pane.
 
+        A leading space character is added to cmd to avoid polluting the
+        user's history.
+
         :param cmd: Text or input into pane
         :type cmd: str
         :param enter: Send enter after sending the input.