Windows_event_accumulation.diff

$ git diff b0eca5828ccd3a5c07b77e82e567c45937de9056
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 118deb9058..ca82a77f1b 100755
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -313,9 +313,7 @@ void OS_Windows::_drag_event(float p_x, float p_y, int idx) {
 };
 
 LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
-
        if (drop_events) {
-
                if (user_proc) {
 
                        return CallWindowProcW(user_proc, hWnd, uMsg, wParam, lParam);
@@ -1304,6 +1302,7 @@ Error OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
        if (RegisterRawInputDevices(Rid, 1, sizeof(Rid[0])) == FALSE) {
                //registration failed.
                use_raw_input = false;
+               printf("No RAW input device found\n");
        }
 
        pre_fs_valid = true;
@@ -2414,8 +2413,42 @@ uint64_t OS_Windows::get_system_time_msecs() const {
        return (uint64_t)(ret / WINDOWS_TICK - MSEC_TO_UNIX_EPOCH);
 }
 
-void OS_Windows::delay_usec(uint32_t p_usec) const {
+// Adapted from https://devblogs.microsoft.com/oldnewthing/20060126-00/?p=32513
+#define MSGF_SLEEPMSG 0x5300
+BOOL SleepMsg(DWORD dwTimeout){
+    DWORD dwStart = GetTickCount();
+    DWORD dwElapsed;
+    while ((dwElapsed = GetTickCount() - dwStart) < dwTimeout) {
+        /*
+         * You may need to play with the correct value for `dwWakeMask`
+         * No QS_TIMER SEEM to be fine       QS_INPUT, QS_POSTMESSAGE, QS_PAINT, QS_HOTKEY, and QS_SENDMESSAGE.
+         * QS_POSTMESSAGE same
+         */
+
+        DWORD dwStatus = MsgWaitForMultipleObjects(0, NULL, 0,
+                                //dwTimeout - dwElapsed, QS_ALLINPUT);
+                                dwTimeout - dwElapsed, QS_ALLINPUT);
+        //printf("Done waiting\n");
+        if (dwStatus == WAIT_OBJECT_0) {
+            MSG msg;
+            while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_QS_INPUT)) {// | PM_QS_INPUT)) {
+                TranslateMessage(&msg);
+                DispatchMessage(&msg);
+            }
+        }
+    }
+    return TRUE; // timed out
+}
 
+void OS_Windows::delay_usec(uint32_t p_usec) const {
+    if(p_usec > 1000){
+        SleepMsg(p_usec/1000);
+        return;
+    }
        if (p_usec < 1000)
                Sleep(1);
        else
@@ -2445,7 +2478,6 @@ void OS_Windows::process_events() {
        }
 
        while (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
-
                TranslateMessage(&msg);
                DispatchMessageW(&msg);
        }
@@ -3338,7 +3370,6 @@ bool OS_Windows::is_disable_crash_handler() const {
 }
 
 void OS_Windows::process_and_drop_events() {
-
        drop_events = true;
        process_events();
        drop_events = false;