dwrite: Fix off by one error in glyph count adjustment.

dlls/dwrite/layout.c

@@ -1269,10 +1269,9 @@ static HRESULT layout_add_effective_run(struct dwrite_textlayout *layout, const
     run->line = line;
 
     if (r->u.regular.run.glyphCount) {
-        /* trim from the left */
+        /* Trim leading and trailing clusters. */
         run->glyphcount = r->u.regular.run.glyphCount - r->u.regular.clustermap[start];
-        /* trim from the right */
-        if (start + length < r->u.regular.descr.stringLength - 1)
+        if (start + length < r->u.regular.descr.stringLength)
             run->glyphcount -= r->u.regular.run.glyphCount - r->u.regular.clustermap[start + length];
     }
     else

dlls/dwrite/tests/layout.c

@@ -1626,7 +1626,7 @@ static void test_Draw(void)
     flush_sequence(sequences, RENDERER_ID);
     hr = IDWriteTextLayout_Draw(layout, &ctxt, &testrenderer, 0.0, 0.0);
     ok(hr == S_OK, "got 0x%08x\n", hr);
-    ok_sequence(sequences, RENDERER_ID, draw_seq, "draw test", TRUE);
+    ok_sequence(sequences, RENDERER_ID, draw_seq, "draw test", FALSE);
     IDWriteTextLayout_Release(layout);
 
     /* with reduced width DrawGlyphRun() is called for every line */
@@ -4987,7 +4987,7 @@ todo_wine
     flush_sequence(sequences, RENDERER_ID);
     hr = IDWriteTextLayout_Draw(layout, NULL, &testrenderer, 0.0f, 0.0f);
     ok(hr == S_OK, "got 0x%08x\n", hr);
-    ok_sequence(sequences, RENDERER_ID, drawunderline4_seq, "draw underline test 4", TRUE);
+    ok_sequence(sequences, RENDERER_ID, drawunderline4_seq, "draw underline test 4", FALSE);
 
     IDWriteTextLayout_Release(layout);