Resolves: tdf#152196 visible gaps with glyph fallback in Arabic/Persian text

Change-Id: I0bf5a10940782f4507e7d632ec37bc4eaa710b03
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143624
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/source/gdi/sallayout.cxx b/vcl/source/gdi/sallayout.cxx
index 2d5a332..85ad838 100644
--- a/vcl/source/gdi/sallayout.cxx
+++ b/vcl/source/gdi/sallayout.cxx
@@ -771,7 +771,7 @@ void MultiSalLayout::ImplAdjustMultiLayout(vcl::text::ImplLayoutArgs& rArgs,
    mnLevel = nLevel;

    // prepare merge the fallback levels
    DeviceCoordinate nXPos = 0;
    double nXPos = 0;
    for( n = 0; n < nLevel; ++n )
        maFallbackRuns[n].ResetPos();