[sysprof/wip/chergert/sysprof-3] libsysprof-ui: use double math

[Christian Hergert <chergert src gnome org>]

commit c4914675b965f5c06a0cbf19fe02619b13a184a1
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 15 13:45:53 2019 -0700

    libsysprof-ui: use double math

 src/libsysprof-ui/sysprof-cell-renderer-duration.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libsysprof-ui/sysprof-cell-renderer-duration.c 
b/src/libsysprof-ui/sysprof-cell-renderer-duration.c
index c904c21..c7050c4 100644
--- a/src/libsysprof-ui/sysprof-cell-renderer-duration.c
+++ b/src/libsysprof-ui/sysprof-cell-renderer-duration.c
@@ -100,7 +100,7 @@ sysprof_cell_renderer_duration_render (GtkCellRenderer      *renderer,
 
   r.x = cell_area->x + x1;
   r.height = 10;
-  r.y = cell_area->y + (cell_area->height - r.height) / 2;
+  r.y = cell_area->y + (cell_area->height - r.height) / 2.0;
   r.width = MAX (1.0, x2 - x1);
 
   gdk_cairo_rectangle (cr, &r);