From 10bd3aeb2ac89a22d5ecfec5942db43e684912ec Mon Sep 17 00:00:00 2001
From: Ben Harris <bjh21@bjh21.me.uk>
Date: Fri, 18 Nov 2022 14:40:56 +0000
Subject: pearl: Return NULL when Backspace or Escape does nothing

When there's no drag in progress, cancelling the drag has no effect.
Returning NULL lets the front-end know this, which in particular means
the Backspace key can leave the app in KaiOS.
---
 pearl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pearl.c b/pearl.c
index e53b4da..27b4860 100644
--- a/pearl.c
+++ b/pearl.c
@@ -2135,7 +2135,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 	}
     }
 
-    if (button == 27 || button == '\b') {
+    if ((button == 27 || button == '\b') && ui->ndragcoords >= 0) {
         ui->ndragcoords = -1;
         return UI_UPDATE;
     }
-- 
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