mshtml: Fix HTMLWindow3_setInterval behavior on 0 msec intervals.

dlls/mshtml/mshtml_private.h

@@ -1096,7 +1096,7 @@ HRESULT push_task(task_t*,task_proc_t,task_proc_t,LONG) DECLSPEC_HIDDEN;
 void remove_target_tasks(LONG) DECLSPEC_HIDDEN;
 void flush_pending_tasks(LONG) DECLSPEC_HIDDEN;
 
-HRESULT set_task_timer(HTMLInnerWindow*,DWORD,BOOL,IDispatch*,LONG*) DECLSPEC_HIDDEN;
+HRESULT set_task_timer(HTMLInnerWindow*,LONG,BOOL,IDispatch*,LONG*) DECLSPEC_HIDDEN;
 HRESULT clear_task_timer(HTMLInnerWindow*,BOOL,DWORD) DECLSPEC_HIDDEN;
 
 const char *debugstr_mshtml_guid(const GUID*) DECLSPEC_HIDDEN;

dlls/mshtml/task.c

@@ -183,7 +183,7 @@ static BOOL queue_timer(thread_data_t *thread_data, task_timer_t *timer)
     return FALSE;
 }
 
-HRESULT set_task_timer(HTMLInnerWindow *window, DWORD msec, BOOL interval, IDispatch *disp, LONG *id)
+HRESULT set_task_timer(HTMLInnerWindow *window, LONG msec, BOOL interval, IDispatch *disp, LONG *id)
 {
     thread_data_t *thread_data;
     task_timer_t *timer;
@@ -199,6 +199,9 @@ HRESULT set_task_timer(HTMLInnerWindow *window, DWORD msec, BOOL interval, IDisp
     if(!timer)
         return E_OUTOFMEMORY;
 
+    if(msec < 1)
+        msec = 1;
+
     timer->id = id_cnt++;
     timer->window = window;
     timer->time = tc + msec;

dlls/mshtml/tests/events.c

@@ -2259,6 +2259,25 @@ static void test_timeout(IHTMLDocument2 *doc)
     hres = IHTMLWindow2_clearTimeout(window, id);
     ok(hres == S_OK, "clearTimeout failed: %08x\n", hres);
 
+    V_VT(&expr) = VT_DISPATCH;
+    V_DISPATCH(&expr) = (IDispatch*)&timeoutFunc;
+    V_VT(&var) = VT_EMPTY;
+    id = 0;
+    hres = IHTMLWindow3_setInterval(win3, &expr, 1, &var, &id);
+    ok(hres == S_OK, "setInterval failed: %08x\n", hres);
+    ok(id, "id = 0\n");
+
+    SET_EXPECT(timeout);
+    pump_msgs(&called_timeout);
+    CHECK_CALLED(timeout);
+
+    SET_EXPECT(timeout);
+    pump_msgs(&called_timeout);
+    CHECK_CALLED(timeout);
+
+    hres = IHTMLWindow2_clearInterval(window, id);
+    ok(hres == S_OK, "clearTimeout failer: %08x\n", hres);
+
     IHTMLWindow3_Release(win3);
 }