From 125e9349c0d5aa8a7425093b57cb547aff384e83 Mon Sep 17 00:00:00 2001
From: Hojun-Cho <ghwns6743@gmail.com>
Date: Wed, 12 Aug 2026 21:35:33 +0900
Subject: [PATCH] fix: pass empty search backspace through

---
 strans.c            |  6 ++++--
 tests/engine_test.c | 36 ++++++++++++++++++++++++++++++++++++
 tests/test.h        |  1 +
 tests/unit_test.c   |  1 +
 4 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/strans.c b/strans.c
index 83bbc54..12c854a 100644
--- a/strans.c
+++ b/strans.c
@@ -620,8 +620,10 @@ searchkey(u32int ks, u32int mod, Str *com)
 		return 1;
 	}
 	if(ks == Kback){
-		if(search.raw.n == 0)
-			return 1;
+		if(search.raw.n == 0){
+			endsearch();
+			return 0;
+		}
 		spopr(&search.raw);
 		searchquery();
 		return 1;
diff --git a/tests/engine_test.c b/tests/engine_test.c
index 656a6f3..ab0ec64 100644
--- a/tests/engine_test.c
+++ b/tests/engine_test.c
@@ -1305,6 +1305,42 @@ engine_hanja_korean_keys(struct ct *t)
 	searchend(&f);
 }
 
+void
+engine_hanja_backspace(struct ct *t)
+{
+	Searchfix f;
+	Str com;
+
+	hanjabegin(&f, LangKO);
+	sclear(&com);
+	CT_CHECK(t, keystroke('h', Mctrl, &com));
+	if(!typekeys(t, "gks", &com))
+		goto cleanup;
+	checkstr(t, "Hanja before backspace", "한", &search.text);
+	CT_EQ_INT(t, 2, im.nkouho);
+	CT_CHECK(t, keystroke(Kback, 0, &com));
+	checkstr(t, "Hanja final backspace", "하", &search.text);
+	CT_EQ_INT(t, 0, im.nkouho);
+	CT_CHECK(t, keystroke(Kback, 0, &com));
+	checkstr(t, "Hanja vowel backspace", "ㅎ", &search.text);
+	CT_CHECK(t, keystroke(Kback, 0, &com));
+	checkstr(t, "empty Hanja search", "", &search.text);
+	CT_EQ_INT(t, LangHANJA, search.lang);
+	CT_CHECK(t, !keystroke(Kback, 0, &com));
+	CT_EQ_INT(t, 0, search.lang);
+
+	if(!typekeys(t, "gks", &com))
+		goto cleanup;
+	CT_CHECK(t, keystroke('h', Mctrl, &com));
+	checkstr(t, "preedit committed before Hanja", "한", &com);
+	CT_EQ_INT(t, LangHANJA, search.lang);
+	CT_CHECK(t, !keystroke(Kback, 0, &com));
+	CT_EQ_INT(t, 0, search.lang);
+	CT_EQ_INT(t, LangKO, im.l->lang);
+cleanup:
+	searchend(&f);
+}
+
 void
 engine_hanja_input_languages(struct ct *t)
 {
diff --git a/tests/test.h b/tests/test.h
index 59fd14a..978ea62 100644
--- a/tests/test.h
+++ b/tests/test.h
@@ -57,6 +57,7 @@ void	engine_emoji_dictionary_identity(struct ct*);
 void	engine_hanja_search(struct ct*);
 void	engine_hanja_unknown_and_cancel(struct ct*);
 void	engine_hanja_korean_keys(struct ct*);
+void	engine_hanja_backspace(struct ct*);
 void	engine_hanja_input_languages(struct ct*);
 void	engine_randomized_stress(struct ct*);
 void	engine_full_boundary_passthrough(struct ct*);
diff --git a/tests/unit_test.c b/tests/unit_test.c
index 4f7c26d..084b294 100644
--- a/tests/unit_test.c
+++ b/tests/unit_test.c
@@ -111,6 +111,7 @@ static const struct ct_test tests[] = {
 	{ "engine/hanja-search", engine_hanja_search },
 	{ "engine/hanja-unknown-cancel", engine_hanja_unknown_and_cancel },
 	{ "engine/hanja-korean-keys", engine_hanja_korean_keys },
+	{ "engine/hanja-backspace", engine_hanja_backspace },
 	{ "engine/hanja-input-languages", engine_hanja_input_languages },
 	{ "engine/randomized-stress", engine_randomized_stress },
 	{ "engine/full-boundary-passthrough", engine_full_boundary_passthrough },