[PATCH v3 1/7] comctl32/tests: Confirm that emptying the listbox sends a LB_RESETCONTENT to itself

[Gabriel Ivăncescu]

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/comctl32/tests/listbox.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/dlls/comctl32/tests/listbox.c b/dlls/comctl32/tests/listbox.c
index 43da3ca..d457b13 100644
--- a/dlls/comctl32/tests/listbox.c
+++ b/dlls/comctl32/tests/listbox.c
@@ -110,6 +110,15 @@ static HWND create_listbox(DWORD add_style, HWND parent)
     return handle;
 }

+static UINT lb_resetcontent_count;
+static WNDPROC lb_test_subclass_proc_prev;
+static LRESULT WINAPI lb_test_subclass_proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    if (msg == LB_RESETCONTENT) lb_resetcontent_count++;
+
+    return CallWindowProcW(lb_test_subclass_proc_prev, hwnd, msg, wParam, lParam);
+}
+
 struct listbox_prop
 {
     DWORD add_style;
@@ -227,6 +236,17 @@ static void run_test(DWORD style, const struct listbox_test test)
     res = SendMessageA(hLB, LB_GETCOUNT, 0, 0);
     ok(res == 4, "Expected 4 items, got %d\n", res);

+    /* Confirm that emptying the listbox sends a LB_RESETCONTENT to itself */
+    lb_test_subclass_proc_prev = (WNDPROC)SetWindowLongPtrW(hLB, GWLP_WNDPROC, (LONG_PTR)lb_test_subclass_proc);
+
+    lb_resetcontent_count = 0;
+    for (i = 4; i--;)
+    {
+        res = SendMessageA(hLB, LB_DELETESTRING, 0, 0);
+        ok(res == i, "Expected %d items, got %d\n", i, res);
+    }
+    ok(lb_resetcontent_count == 1, "Expected 1 LB_RESETCONTENT message, got %u\n", lb_resetcontent_count);
+
     DestroyWindow(hLB);
 }

@@ -1798,6 +1818,14 @@ static void test_set_count( void )
     GetUpdateRect( listbox, &r, TRUE );
     ok( !IsRectEmpty( &r ), "got empty rect\n");

+    /* Confirm that emptying the listbox sends a LB_RESETCONTENT to itself */
+    lb_test_subclass_proc_prev = (WNDPROC)SetWindowLongPtrW(listbox, GWLP_WNDPROC, (LONG_PTR)lb_test_subclass_proc);
+
+    lb_resetcontent_count = 0;
+    ret = SendMessageA(listbox, LB_SETCOUNT, 0, 0);
+    ok(ret == 0, "got %d\n", ret);
+    ok(lb_resetcontent_count == 1, "Expected 1 LB_RESETCONTENT message, got %u\n", lb_resetcontent_count);
+
     DestroyWindow( listbox );

for (i = 0; i < ARRAY_SIZE(styles); ++i)