dwrite: Update current line count when adding metrics for new line.

dlls/dwrite/layout.c

@@ -1033,6 +1033,7 @@ static HRESULT layout_set_line_metrics(struct dwrite_textlayout *layout, DWRITE_
     }
 
     layout->lines[*line] = *metrics;
+    layout->line_count += 1;
     *line += 1;
     return S_OK;
 }
@@ -1198,8 +1199,6 @@ static HRESULT layout_compute_effective_runs(struct dwrite_textlayout *layout)
         textpos += layout->clustermetrics[i].length;
     }
 
-    layout->line_count = line;
-
     /* Now all line info is here, update effective runs positions in flow direction */
     erun = layout_get_next_erun(layout, NULL);
     inrun = layout_get_next_inline_run(layout, NULL);