comctl32/updown: Don't update buddy text if it's the same.

dlls/comctl32/tests/updown.c

@@ -59,6 +59,9 @@
 #define EDIT_SEQ_INDEX      1
 #define UPDOWN_SEQ_INDEX    2
 
+#define UPDOWN_ID           0
+#define BUDDY_ID            1
+
 static HWND parent_wnd, g_edit;
 
 static BOOL (WINAPI *pSetWindowSubclass)(HWND, SUBCLASSPROC, UINT_PTR, DWORD_PTR);
@@ -156,6 +159,11 @@ static const struct message test_updown_unicode_seq[] = {
     { 0 }
 };
 
+static const struct message test_updown_pos_nochange_seq[] = {
+    { WM_GETTEXT, sent|id, 0, 0, BUDDY_ID },
+    { 0 }
+};
+
 static LRESULT WINAPI parent_wnd_proc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
     static LONG defwndproc_counter = 0;
@@ -233,6 +241,7 @@ static LRESULT WINAPI edit_subclass_proc(HWND hwnd, UINT message, WPARAM wParam,
     if (defwndproc_counter) msg.flags |= defwinproc;
     msg.wParam = wParam;
     msg.lParam = lParam;
+    msg.id     = BUDDY_ID;
     add_message(sequences, EDIT_SEQ_INDEX, &msg);
 
     defwndproc_counter++;
@@ -274,6 +283,7 @@ static LRESULT WINAPI updown_subclass_proc(HWND hwnd, UINT message, WPARAM wPara
     if (defwndproc_counter) msg.flags |= defwinproc;
     msg.wParam = wParam;
     msg.lParam = lParam;
+    msg.id     = UPDOWN_ID;
     add_message(sequences, UPDOWN_SEQ_INDEX, &msg);
 
     defwndproc_counter++;
@@ -360,6 +370,19 @@ static void test_updown_pos(void)
     ok_sequence(sequences, UPDOWN_SEQ_INDEX, test_updown_pos_seq , "test updown pos", FALSE);
 
     DestroyWindow(updown);
+
+    /* there's no attempt to update buddy Edit if text didn't change */
+    SetWindowTextA(g_edit, "50");
+    updown = create_updown_control(UDS_ALIGNRIGHT | UDS_SETBUDDYINT, g_edit);
+
+    flush_sequences(sequences, NUM_MSG_SEQUENCES);
+
+    r = SendMessage(updown, UDM_SETPOS, 0, 50);
+    expect(50,r);
+    ok_sequence(sequences, EDIT_SEQ_INDEX, test_updown_pos_nochange_seq,
+                "test updown pos, no change", FALSE);
+
+    DestroyWindow(updown);
 }
 
 static void test_updown_pos32(void)
@@ -434,6 +457,19 @@ static void test_updown_pos32(void)
     ok_sequence(sequences, UPDOWN_SEQ_INDEX, test_updown_pos32_seq, "test updown pos32", FALSE);
 
     DestroyWindow(updown);
+
+    /* there's no attempt to update buddy Edit if text didn't change */
+    SetWindowTextA(g_edit, "50");
+    updown = create_updown_control(UDS_ALIGNRIGHT | UDS_SETBUDDYINT, g_edit);
+
+    flush_sequences(sequences, NUM_MSG_SEQUENCES);
+
+    r = SendMessage(updown, UDM_SETPOS32, 0, 50);
+    expect(50,r);
+    ok_sequence(sequences, EDIT_SEQ_INDEX, test_updown_pos_nochange_seq,
+                "test updown pos, no change", FALSE);
+
+    DestroyWindow(updown);
 }
 
 static void test_updown_buddy(void)

dlls/comctl32/updown.c

@@ -310,7 +310,7 @@ static BOOL UPDOWN_GetBuddyInt (UPDOWN_INFO *infoPtr)
 static BOOL UPDOWN_SetBuddyInt (const UPDOWN_INFO *infoPtr)
 {
     WCHAR fmt[3] = { '%', 'd', '\0' };
-    WCHAR txt[20];
+    WCHAR txt[20], txt_old[20] = { 0 };
     int len;
 
     if (!((infoPtr->Flags & FLAG_BUDDYINT) && IsWindow(infoPtr->Buddy)))
@@ -345,6 +345,10 @@ static BOOL UPDOWN_SetBuddyInt (const UPDOWN_INFO *infoPtr)
         *dst = 0;
     }
 
+    /* if nothing changed exit earlier */
+    GetWindowTextW(infoPtr->Buddy, txt_old, sizeof(txt_old)/sizeof(WCHAR));
+    if (lstrcmpiW(txt_old, txt) == 0) return 0;
+
     return SetWindowTextW(infoPtr->Buddy, txt);
 }