dwrite/arabic: Mark glyphs with assigned action as unsafe to break.

dlls/dwrite/dwrite_private.h

@@ -690,6 +690,8 @@ extern void opentype_layout_apply_gpos_features(struct scriptshaping_context *co
 extern BOOL opentype_layout_check_feature(struct scriptshaping_context *context, unsigned int script_index,
         unsigned int language_index, struct shaping_feature *feature, unsigned int glyph_count,
         const UINT16 *glyphs, UINT8 *feature_applies) DECLSPEC_HIDDEN;
+extern void opentype_layout_unsafe_to_break(struct scriptshaping_context *context, unsigned int start,
+        unsigned int end) DECLSPEC_HIDDEN;
 extern BOOL opentype_has_vertical_variants(struct dwrite_fontface *fontface) DECLSPEC_HIDDEN;
 extern HRESULT opentype_get_vertical_glyph_variants(struct dwrite_fontface *fontface, unsigned int glyph_count,
         const UINT16 *nominal_glyphs, UINT16 *glyphs) DECLSPEC_HIDDEN;

dlls/dwrite/opentype.c

@@ -5127,7 +5127,7 @@ static BOOL opentype_layout_context_match_input(const struct match_context *mc,
 }
 
 /* Marks text segment as unsafe to break between [start, end) glyphs. */
-static void opentype_layout_unsafe_to_break(struct scriptshaping_context *context, unsigned int start,
+void opentype_layout_unsafe_to_break(struct scriptshaping_context *context, unsigned int start,
         unsigned int end)
 {
     unsigned int i;

dlls/dwrite/shapers/arabic.c

@@ -174,7 +174,12 @@ static void arabic_setup_masks(struct scriptshaping_context *context,
 
     /* Unaffected glyphs get action NONE with zero mask. */
     for (i = 0; i < context->glyph_count; ++i)
-        context->glyph_infos[i].mask |= masks[arabic_get_shaping_action(context, i)];
+    {
+        enum arabic_shaping_action action = arabic_get_shaping_action(context, i);
+        if (action != NONE)
+            opentype_layout_unsafe_to_break(context, i, i + 1);
+        context->glyph_infos[i].mask |= masks[action];
+    }
 }
 
 const struct shaper arabic_shaper =