Resolves: tdf#89231 if no font has 0x202F fallback to a normal space

Change-Id: I2325c0b09ccf66ee15597251ad027b295de5502f

vcl/generic/glyphs/gcach_layout.cxx

@@ -488,6 +488,12 @@ bool HbLayoutEngine::Layout(ServerFontLayout& rLayout, ImplLayoutArgs& rArgs)
                 int32_t nGlyphIndex = pHbGlyphInfos[i].codepoint;
                 int32_t nCharPos = pHbGlyphInfos[i].cluster;
 
+                // tdf#89231 if it's just a missing non-breaking space, then use a normal space
+                if (!nGlyphIndex && (SalLayoutFlags::ForFallback & rArgs.mnFlags) && nCharPos >= 0 && rArgs.mpStr[nCharPos] == 0x202F)
+                {
+                    nGlyphIndex = rFont.GetGlyphIndex(' ');
+                }
+
                 // if needed request glyph fallback by updating LayoutArgs
                 if (!nGlyphIndex)
                 {

vcl/source/outdev/font.cxx

@@ -2104,7 +2104,10 @@ SalLayout* OutputDevice::ImplGlyphFallbackLayout( SalLayout* pSalLayout, ImplLay
         if( nFallbackLevel < MAX_FALLBACK-1)
         {
             // ignore fallback font if it is the same as the original font
-            if( mpFontEntry->maFontSelData.mpFontData == aFontSelData.mpFontData )
+            // unless we are looking for a substituion for 0x202F, in which
+            // case we'll just use a normal space
+            if( mpFontEntry->maFontSelData.mpFontData == aFontSelData.mpFontData &&
+                aMissingCodes.indexOf(0x202F) == -1 )
             {
                 mpFontCache->Release( pFallbackFont );
                 continue;