tdf#120787: fine-tune window flags w/ focus on floating toolbars

Floating toolbars are tool windows (Qt::Tool, not Qt::Window which
has a separate taskbar entry). They are frameles
(Qt::FramelessWindowHint) bc LibO takes care of drawing window
decorations itself. They also must be able to receive keyboard focus
(remove Qt::WindowDoesNotAcceptFocus)

Change-Id: I61e8a905fdc4fde1a64df5a0824d358036cfcdea
Reviewed-on: https://gerrit.libreoffice.org/67768
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
diff --git a/vcl/qt5/Qt5Frame.cxx b/vcl/qt5/Qt5Frame.cxx
index 656cd6d..26db19e 100644
--- a/vcl/qt5/Qt5Frame.cxx
+++ b/vcl/qt5/Qt5Frame.cxx
@@ -93,6 +93,11 @@ Qt5Frame::Qt5Frame(Qt5Frame* pParent, SalFrameStyleFlags nStyle, bool bUseCairo)
    {
        if (nStyle & SalFrameStyleFlags::INTRO)
            aWinFlags |= Qt::SplashScreen;
        // floating toolbars are frameless tool windows
        // + they must be able to receive keyboard focus
        else if ((nStyle & SalFrameStyleFlags::FLOAT)
                 && (nStyle & SalFrameStyleFlags::OWNERDRAWDECORATION))
            aWinFlags |= Qt::Tool | Qt::FramelessWindowHint;
        else if (nStyle & (SalFrameStyleFlags::FLOAT | SalFrameStyleFlags::TOOLTIP))
            aWinFlags |= Qt::ToolTip;
        else if ((nStyle & SalFrameStyleFlags::FLOAT)
@@ -102,8 +107,6 @@ Qt5Frame::Qt5Frame(Qt5Frame* pParent, SalFrameStyleFlags nStyle, bool bUseCairo)
            aWinFlags |= Qt::Dialog;
        else if (nStyle & SalFrameStyleFlags::TOOLWINDOW)
            aWinFlags |= Qt::Tool;
        else if (nStyle & SalFrameStyleFlags::OWNERDRAWDECORATION)
            aWinFlags |= Qt::Window | Qt::FramelessWindowHint | Qt::WindowDoesNotAcceptFocus;
        else
            aWinFlags |= Qt::Window;
    }