Trying to avoid flicker with half success using WS_EX_COMPOSITED. Experiencing same issue of flickering edit control when mouse move over it.

Question

I need help on this maybe old and long issue of flicker in C Win32 Native programming. Can somebody here help me with it. I've done some googling about it but didn't found perfect answer for my situation.

My application is maybe simple.

It's a window with splitter in-between these two controls:

Left is a Listview control (not flickering anymore).

HWND
CreateListView(HWND hwndParent)
{
   RECT rcClient;

   GetClientRect(hwndParent, &rcClient);
   
   HWND hWndListView = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTVIEW, L"",
         WS_VISIBLE | WS_CHILD | WS_CLIPCHILDREN | LVS_REPORT | LVS_EDITLABELS, 0, 0,
         rcClient.right - rcClient.left,
         rcClient.bottom - rcClient.top,
         hwndParent, (HMENU) IDL_LV1, g_hInstance, NULL);

   InitListViewColumns(hWndListView);

   return (hWndListView);
}

Right is an Edit box control.

HWND
CreateEditView(HWND hwndParent)
{
   HDC hdc = GetDC(hwndParent);

   // Create Font
   const TCHAR* fontName = TEXT("Myanmar Text");
   const long nFontSize = 8;
   LOGFONT lf = {0};
   lf.lfHeight = -MulDiv(nFontSize, GetDeviceCaps(hdc, LOGPIXELSY), 72);
   //lf.lfWeight = FW_BOLD;
   lstrcpy(lf.lfFaceName, fontName);
   HFONT s_hFont = CreateFontIndirect(&lf);

   // Create the edit control
   // WS_EX_COMPOSITED 
 	HWND hwndEV = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("edit"), NULL,
         WS_CHILD | WS_VISIBLE | WS_VSCROLL | ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL,
			0, 0, 0, 0, hwndParent, (HMENU) IDE_EDIT_VIEW, g_hInstance, NULL);	

   // Set the font for this control
   SendMessage(hwndEV, WM_SETFONT, (WPARAM) s_hFont, (LPARAM) MAKELONG(TRUE, 0));
   
   ReleaseDC(hwndParent, hdc);
   return hwndEV;
}

I solved the flicker on the Listview by simple setting it to WS_CLIPCHILDREN style.

Now while moving splitter, I managed to lessen the flicker on Edit box using a trick of a timer and using WS_EX_COMPOSITED on the main window. Though not 100% flicker free, I am ok to settle on the result. However, I noticed something odd on it. When the main window is on initial state (I mean when the window first load: not resized yet), the flicker trick i did is working good at least in my opinion. However when I started to resize the main window (drag the borders of the window, minimized it, maximized it), the odd things will happen. Now anytime I move in and out the mouse pointer on the Edit box it flickers. It flickers too now when I move the splitter (after I resized the main window of course). I hope I can show the video of it.

PS: Flicker is noticeable only when there is text(s) on the edit control.

Anyone who can help here is highly appreciated.

Thank you!