[librsvg] measure_text(): Don't frob the ctx->render->pango_context here

[Federico Mena Quintero <federico src gnome org>]

commit 205cf3bb96cf4123ca93f6281980d1d157d5ed5d
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Dec 6 10:39:29 2017 -0600

    measure_text(): Don't frob the ctx->render->pango_context here

 rsvg-text.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/rsvg-text.c b/rsvg-text.c
index df94f93..e0d56c9 100644
--- a/rsvg-text.c
+++ b/rsvg-text.c
@@ -704,19 +704,20 @@ rsvg_text_render_text (RsvgDrawingCtx * ctx, const char *text, gdouble * x, gdou
 static gdouble
 measure_text (RsvgDrawingCtx * ctx, const char *text)
 {
+    PangoContext *context;
     PangoLayout *layout;
     gint width;
     gdouble scaled_width;
 
-    if (ctx->pango_context == NULL)
-        ctx->pango_context = ctx->render->get_pango_context (ctx);
+    context = ctx->render->get_pango_context (ctx);
 
-    layout = rsvg_text_create_layout (ctx, text, ctx->pango_context);
+    layout = rsvg_text_create_layout (ctx, text, context);
 
     pango_layout_get_size (layout, &width, NULL);
     scaled_width = width / (double)PANGO_SCALE;
 
     g_object_unref (layout);
+    g_object_unref (context);
 
     return scaled_width;
 }