Full DarkMode support for TaskDialog

Credits to https://github.com/SFTRS/DarkTaskDialog
- Highlighting and Graph colors: menu - Reset added
- Fix drawing of disabled ListView in dark theme
- SysLink theme support (call PhInitializeSysLinkTheme to apply to control)

SystemInformer/about.c

@@ -72,6 +72,8 @@ static INT_PTR CALLBACK PhpAboutDlgProc(
  PhRegisterWindowCallback(hwndDlg, PH_PLUGIN_WINDOW_EVENT_TYPE_TOPMOST, NULL);
 
  PhInitializeWindowTheme(hwndDlg, PhEnableThemeSupport);
+ if (PhEnableThemeSupport)
+ PhInitializeSysLinkTheme(GetDlgItem(hwndDlg, IDC_LINK_SF));
  }
  break;
  case WM_DESTROY:

SystemInformer/chdlg.c

@@ -568,11 +568,13 @@ INT_PTR CALLBACK PhChooseNewPageDlgProc(
  if (PhEnableThemeSupport)
  {
  SetDCBrushColor(hdc, RGB(50, 50, 50));
- FillRect(hdc, &clientRect, GetStockObject(DC_BRUSH));
- clientRect.bottom = clientRect.top + PhGetDpi(2, dpi);
- InflateRect(&clientRect, -1, 0);
- SetDCBrushColor(hdc, RGB(36, 36, 36));
- FillRect(hdc, &clientRect, GetStockObject(DC_BRUSH));
+ FillRect(hdc, &clientRect, PhGetStockBrush(DC_BRUSH));
+ clientRect.bottom = clientRect.top + 1;
+ SetDCBrushColor(hdc, PhThemeWindowForegroundColor);
+ FillRect(hdc, &clientRect, PhGetStockBrush(DC_BRUSH));
+ PhOffsetRect(&clientRect, 0, 1);
+ SetDCBrushColor(hdc, PhThemeWindowBackground2Color);
+ FillRect(hdc, &clientRect, PhGetStockBrush(DC_BRUSH));
  }
  else
  {