Win32 TabControl Flicker

InNeedOfHelp (2)
I made a GUI with a native splitter separating a ListView and TabControl. The TabControl has two child windows an input and output window. The main problem is when I try to move the splitter everything moves as intended however the TabControl flickers a lot. I have spent days looking up on how to fix this issue and have tried everything. I have tried double buffering the TabControl with WS_EX_COMPOSITED and it works but when I move the splitter I can see gray artifacts from what I assume is the hbrbackground on the main window class. After seeing this issue, I kept WS_EX_COMPOSITED on the TabControl and tried putting WS_EX_COMPOSITED on the main window as well and while it removed the gray artifacts from showing when I moved the splitter the TabControl starting flickering again. It seems I can not double buffer the main window and the TabControl at the same time. If you are compiling with visual studio make sure to add Comctl32.lib, UxTheme.lib to the linker (I am using visual studios). Can someone please help me fix this?

InNeedOfHelp (2)
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#include <Windows.h>
#include <commctrl.h>
#include <windowsx.h>
#include <process.h>
#include <iostream>
#include <Uxtheme.h>

struct _WINDOW_HANDLES
{
	HWND Main;
	HWND ListView;
	HWND TabControl;
	HWND OutputWindow;
	HWND InputWindow;
	HWND SplitterProc;
} wh;

HINSTANCE ghInst;

LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK TabControlProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK SplitterProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

static WNDPROC TabControlWndProc;
static WNDPROC TabOutputWndProc;
static WNDPROC SplitterWndProc;

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR args, int ncmdshow)
{
	WNDCLASSW wc;
	memset(&wc, 0, sizeof(WNDCLASSW));
	wc.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hInstance = hInst;
	wc.lpszClassName = L"MainWindowClass";
	wc.lpfnWndProc = WindowProcedure;

	if (!RegisterClassW(&wc))
		return -1;

	wh.Main = CreateWindowExW(NULL, L"MainWindowClass", L"GUI", WS_OVERLAPPEDWINDOW | WS_EX_COMPOSITED, CW_USEDEFAULT, CW_USEDEFAULT, 1300, 700, NULL, NULL, hInst, NULL);
	ShowWindow(wh.Main, ncmdshow);

	MSG msg;
	memset(&msg, 0, sizeof(MSG));

	while (GetMessageW((&msg), NULL, NULL, NULL))
	{
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	}

	return 0;
}

VOID InitializeComponent(HWND hWnd)
{
	RECT rcMain;
	GetClientRect(hWnd, &rcMain);
	
	wh.ListView = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTVIEW, L"", WS_CHILD | WS_VISIBLE | LVS_REPORT, 0, 0, rcMain.right, 180, hWnd, (HMENU)0, ghInst, NULL);
	ListView_SetExtendedListViewStyle(wh.ListView, LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES);

	LVCOLUMN lvc;
	memset(&lvc, 0, sizeof(LVCOLUMN));
	lvc.mask = LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM;
	lvc.iSubItem = 0;
	lvc.cx = 125;
	lvc.pszText = (LPWSTR)L"Column 1";
	ListView_InsertColumn(wh.ListView, 0, &lvc);

	lvc.iSubItem = 1;
	lvc.cx = 125;
	lvc.pszText = (LPWSTR)L"Column 2";
	ListView_InsertColumn(wh.ListView, 1, &lvc);

	LVITEM lvi;
	memset(&lvi, 0, sizeof(LVITEM));
	lvi.mask = LVIF_TEXT;
	lvi.iItem = 0;
	lvi.iSubItem = 0;
	lvi.pszText = (LPWSTR)L"Item 1";
	ListView_InsertItem(wh.ListView, &lvi);

	ListView_SetItemText(wh.ListView, 0, 1, (LPWSTR)L"Item 2");

	

	wh.TabControl = CreateWindowEx(WS_EX_CLIENTEDGE, WC_TABCONTROL, L"", WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE, 0, 196, rcMain.right, rcMain.bottom - 196, hWnd, (HMENU)0, ghInst, NULL);

	TCITEM tie;
	tie.mask = TCIF_TEXT;
	tie.pszText = (LPWSTR)L"Tab";
	TabCtrl_InsertItem(wh.TabControl, 0, &tie);
	
	TabControlWndProc = (WNDPROC)SetWindowLongPtr(wh.TabControl, GWLP_WNDPROC, (LONG_PTR)TabControlProc);
	
	LOGFONT lf;
	GetObject(GetStockObject(DEFAULT_GUI_FONT), sizeof(LOGFONT), &lf);
	HFONT hFont = CreateFont(
		19, 0,
		lf.lfEscapement, lf.lfOrientation, lf.lfWeight,
		lf.lfItalic, lf.lfUnderline, lf.lfStrikeOut,
		lf.lfCharSet, lf.lfOutPrecision, lf.lfClipPrecision,
		lf.lfQuality, lf.lfPitchAndFamily, NULL);
	SendMessage(wh.TabControl, WM_SETFONT, (WPARAM)hFont, TRUE);

	HFONT IFont = CreateFont(
		17, 0,
		lf.lfEscapement, lf.lfOrientation, lf.lfWeight,
		lf.lfItalic, lf.lfUnderline, lf.lfStrikeOut,
		lf.lfCharSet, lf.lfOutPrecision, lf.lfClipPrecision,
		lf.lfQuality, lf.lfPitchAndFamily, NULL);
	
	wh.OutputWindow = CreateWindowEx(WS_EX_CLIENTEDGE, WC_EDIT, L"", WS_CHILD | WS_VISIBLE | WS_VSCROLL | ES_MULTILINE | ES_WANTRETURN, 0, 25, rcMain.right, rcMain.bottom - 251, wh.TabControl, NULL, ghInst, NULL);
	SendMessage(wh.OutputWindow, EM_SETREADONLY, TRUE, 0);
	SendMessage(wh.OutputWindow, WM_SETFONT, (WPARAM)hFont, TRUE);

	wh.InputWindow = CreateWindowEx(WS_EX_CLIENTEDGE, WC_EDIT, L"", WS_CHILD | WS_VISIBLE, 0, rcMain.bottom - 227, rcMain.right, 28, wh.TabControl, NULL, ghInst, NULL);
	SendMessage(wh.InputWindow, WM_SETFONT, (WPARAM)IFont, TRUE);
	
	wh.SplitterProc = CreateWindowEx(NULL, WC_STATIC, L"", WS_CHILD | WS_BORDER | WS_VISIBLE | SS_NOTIFY | SS_CENTER, 0, 181, rcMain.right, 17, hWnd, NULL, ghInst, NULL);
	SplitterWndProc = (WNDPROC)SetWindowLongPtr(wh.SplitterProc, GWLP_WNDPROC, (LONG_PTR)SplitterProc);
}

LRESULT CALLBACK SplitterProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static BOOL bSplitterMoving;

	RECT rcMain, rcListView;
	GetClientRect(wh.Main, &rcMain);
	GetClientRect(wh.ListView, &rcListView);

	switch (message)
	{
		case WM_SETCURSOR:
		{
			SetCursor(LoadCursor(NULL, IDC_SIZENS));
			SetWindowLongPtr(hwnd, DWLP_MSGRESULT, TRUE);
			return TRUE;
		}

		case WM_LBUTTONDOWN:
		{
			bSplitterMoving = TRUE;
			SetCapture(wh.SplitterProc);
			return 0;
		}
		break;

		case WM_LBUTTONUP:
		{
			ReleaseCapture();
			bSplitterMoving = FALSE;
			return 0;
		}

		case WM_MOUSEMOVE:
		{

			POINT  pt{ GET_X_LPARAM(lParam),GET_Y_LPARAM(lParam) };
			ClientToScreen(wh.SplitterProc, &pt);
			ScreenToClient(wh.Main, &pt);

			auto newSplitterPos = pt.y;
			if (newSplitterPos <= 125 || newSplitterPos >= 350)
			{
				return 0;
			}
			
			if (bSplitterMoving)
			{
				POINT  pt{ GET_X_LPARAM(lParam),GET_Y_LPARAM(lParam) };
				ClientToScreen(wh.SplitterProc, &pt);
				ScreenToClient(wh.Main, &pt);

				auto newSplitterPos = pt.y;
			
				MoveWindow(wh.SplitterProc, 0, newSplitterPos, rcMain.right, 17, TRUE);
				MoveWindow(wh.ListView, 0, 0, rcMain.right, newSplitterPos, TRUE); 

				MoveWindow(wh.TabControl, rcMain.left, newSplitterPos + 15, rcMain.right, rcMain.bottom - (newSplitterPos + 15), TRUE); 
				MoveWindow(wh.OutputWindow, 0, 25, rcMain.right, rcMain.bottom - (newSplitterPos + 71), TRUE); 
				MoveWindow(wh.InputWindow, rcMain.left, rcMain.bottom - (newSplitterPos + 46), rcMain.right, 28, TRUE); 
			}
			return 0;
		}
	}
	return CallWindowProc(SplitterWndProc, hwnd, message, wParam, lParam);
}


LRESULT CALLBACK TabControlProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_CTLCOLORSTATIC:
		{
			HDC hdcStatic = (HDC)wParam;
			SetTextColor(hdcStatic, RGB(255, 255, 255));
			SetBkColor(hdcStatic, RGB(0, 0, 0));
			HBRUSH hbrBkgnd = CreateSolidBrush(RGB(0, 0, 0));
			return (INT_PTR)hbrBkgnd;
		}

		case WM_CTLCOLOREDIT:
		{
			HDC hdcStatic = (HDC)wParam;
			SetTextColor(hdcStatic, RGB(255, 255, 255));
			SetBkColor(hdcStatic, RGB(0, 0, 0));
			HBRUSH hbrBkgnd = CreateSolidBrush(RGB(0, 0, 0));
			return (INT_PTR)hbrBkgnd;
		}
	}
	return CallWindowProc(TabControlWndProc, hDlg, message, wParam, lParam);
}

LRESULT CALLBACK WindowProcedure(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
{
	RECT rcMain, rcListView, rcTabControl;
	GetClientRect(hWnd, &rcMain);
	GetClientRect(wh.ListView, &rcListView);
	GetClientRect(wh.TabControl, &rcTabControl);

	switch (msg)
	{
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
	
		case WM_CREATE:
		{
			InitializeComponent(hWnd);
			break;
		}

		case WM_SIZE:
		{
			POINT  pt{ GET_X_LPARAM(lp),GET_Y_LPARAM(lp) };
			ClientToScreen(wh.SplitterProc, &pt);
			ScreenToClient(wh.Main, &pt);
			int newSplitterPos = pt.y;
		
			SetWindowPos(wh.ListView, NULL, rcMain.left, rcMain.left, rcMain.right, newSplitterPos - rcMain.bottom - 1, SWP_NOMOVE);
			ListView_SetColumnWidth(wh.ListView, 1, LVSCW_AUTOSIZE_USEHEADER);
			SetWindowPos(wh.TabControl, NULL, rcMain.left, newSplitterPos - (9 + rcTabControl.bottom + rcListView.bottom), rcMain.right, rcMain.bottom - (rcListView.bottom + 19), SWP_NOMOVE);
			MoveWindow(wh.OutputWindow, 0, 25, rcMain.right, rcMain.bottom - (rcListView.bottom + 75), TRUE);
			MoveWindow(wh.InputWindow, rcMain.left, rcMain.bottom - (rcListView.bottom + 51), rcMain.right, 28, TRUE);
			SetWindowPos(wh.SplitterProc, NULL, rcMain.left, newSplitterPos - (24 + rcTabControl.bottom + rcListView.bottom), LOWORD(lp), 17, SWP_NOMOVE);
			SetWindowText(wh.SplitterProc, L"...");

			break;
		}
	}
	return DefWindowProcW(hWnd, msg, wp, lp);
}
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