tdf#140006 don't limit dropdown width to 300pixels

let it use the full width of the cell. Keep that 300 pixel limit
if we are expanding the widget width beyond its size request.

Change-Id: Ifeaa9ee60e0d5649de71c960ae83270fb1afb2e7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110682
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
diff --git a/sc/source/ui/view/gridwin.cxx b/sc/source/ui/view/gridwin.cxx
index 34d3ed0..fa8b2a4 100644
--- a/sc/source/ui/view/gridwin.cxx
+++ b/sc/source/ui/view/gridwin.cxx
@@ -959,10 +959,9 @@ void ScGridWindow::ShowFilterMenu(const tools::Rectangle& rCellRect, bool bLayou
    auto nHeight = rFilterBox.get_height_rows(nEntryCount);
    rFilterBox.set_size_request(-1, nHeight);
    Size aSize(rFilterBox.get_preferred_size());
    if (aSize.Width() < nSizeX)
        aSize.setWidth(nSizeX);
    if (aSize.Width() > 300)
        aSize.setWidth(300);     // do not over do it (Pixel)
    auto nMaxToExpandTo = std::min(nSizeX, static_cast<decltype(nSizeX)>(300));     // do not over do it (Pixel)
    if (aSize.Width() < nMaxToExpandTo)
        aSize.setWidth(nMaxToExpandTo);

    aSize.AdjustWidth(4); // add a little margin
    nSizeX += 4;