Add a new mappable action `close_other_windows_in_tab` to close all but the active window

Fixes #2484

docs/changelog.rst

@@ -10,6 +10,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - Fix a regression in 0.17 that broke drawing of borders with non-minimal
   borders (:iss:`2474`)
 
+- Add a new mappable action ``close_other_windows_in_tab`` to close all but the
+  active window (:iss:`2484`)
+
 - Hints kitten: Adjust the default regex used to detect line numbers to handle
   line+column numbers (:iss:`2268`)
 

docs/index.rst

@@ -192,6 +192,12 @@ Similarly, you can detach the current tab, with::
     # asks which OS Window to move the tab into
     map ctrl+f4 detach_tab ask
 
+Finally, you can define a shortcut to close all windows in a tab other than
+the currently active window::
+
+    map f9 close_other_windows_in_tab
+
+
 Other keyboard shortcuts
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