Search in selections (#10831)

Release Notes:

- Adding [#8617 ](https://github.com/zed-industries/zed/issues/8617)

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

assets/keymaps/default-linux.json

@@ -232,7 +232,8 @@
       "shift-enter": "search::SelectPrevMatch",
       "alt-enter": "search::SelectAllMatches",
       "ctrl-f": "search::FocusSearch",
-      "ctrl-h": "search::ToggleReplace"
+      "ctrl-h": "search::ToggleReplace",
+      "ctrl-l": "search::ToggleSelection"
     }
   },
   {
@@ -296,6 +297,7 @@
       "ctrl-alt-g": "search::SelectNextMatch",
       "ctrl-alt-shift-g": "search::SelectPrevMatch",
       "ctrl-alt-shift-h": "search::ToggleReplace",
+      "ctrl-alt-shift-l": "search::ToggleSelection",
       "alt-enter": "search::SelectAllMatches",
       "alt-c": "search::ToggleCaseSensitive",
       "alt-w": "search::ToggleWholeWord",