Description of the Issue

When Notepad++ is started and Select and Find Next (Ctrl+F3) is pressed for the first time, the Find dialog flickers.

Steps to Reproduce the Issue

1. Start Notepad++
2. Press Ctrl+F3 - the Find dialog flickers
3. To reproduce it better, open the source file "PowerEditor\src\ScintillaComponent\FindReplaceDlg.cpp", find the method "FindReplaceDlg::create", add ::Sleep(1000); right after the line ::SetWindowPos(_hSelf, HWND_TOP, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, SWP_SHOWWINDOW); and rebuild Notepad++.

Expected Behavior

As Ctrl+F3 performs a "silent search" for a given word, no flickering is expected.

Actual Behavior

The Find dialogs flickers.

One of possible ways to fix this issue is to extract the

NppParameters& nppParam = NppParameters::getInstance();
NppGUI& nppGUI = const_cast<NppGUI&>(nppParam.getNppGUI());
if (nppGUI._findWindowPos.bottom - nppGUI._findWindowPos.top != 0)  // check height against 0 as a test of valid data from config
{
    RECT rc = getViewablePositionRect(nppGUI._findWindowPos);
    ::SetWindowPos(_hSelf, HWND_TOP, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, SWP_SHOWWINDOW);
    //Sleep(1000);
}
else
{
    goToCenter();
}

into a separate method that is called only when toShow is true.
Such approach, however, adds another problem: the keyboard focus is for some reason "stolen" from Scintilla and does not return back to it. According to my investigations, the focus is "stolen" as the result of calling _hSelf = ::CreateDialogParam(_hInst, MAKEINTRESOURCE(dialogID), _hParent, dlgProc, reinterpret_cast<LPARAM>(this)); within "StaticDialog::create" (this one is called from the "FindReplaceDlg::create").