found via cppcheck:

remove code that will never run
make definition and declaration names for parameters match
change floats that were being set to bool values
remove pointer that is never used

1 files changed, 0 insertions, 2 deletions

diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index 08f1bdff3d..f5eafba513 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -2352,8 +2352,6 @@ void Tree::_gui_input(Ref<InputEvent> p_event) {
 						last_keypress = 0;
 				}
 			} break;
-
-				last_keypress = 0;
 		}
 	}