Benchmark: tweak opendata link to be centered correctly.

benchmark/space/__init__.py

@@ -452,6 +452,14 @@ def benchmark_thread(ctx):
 ################################################################################
 # Panels
 
+def ui_scale_factor(x):
+    # To position the buttons exactly we add spacing, but there can be
+    # rounding errors with non-integer DPI scaling. We roughly compensate
+    # for those here.
+    ui_scale = bpy.context.user_preferences.system.ui_scale
+    widget_height = 20 * ui_scale
+    return x * widget_height / int(widget_height)
+
 class BENCHMARK_PT_main(Panel):
     bl_label = "Benchmark"
     bl_options = {'HIDE_HEADER'}
@@ -461,8 +469,10 @@ class BENCHMARK_PT_main(Panel):
     def draw_link(self, context):
         layout = self.layout
 
-        layout.separator()
-        layout.separator()
+        col = layout.column()
+        col.scale_y = ui_scale_factor(0.35)
+        col.label(text="")
+
         col = layout.column()
 
         sub = col.row()
@@ -481,7 +491,7 @@ class BENCHMARK_PT_main(Panel):
 
         col = split.column()
         sub = col.row()
-        sub.scale_y = 64.0
+        sub.scale_y = ui_scale_factor(64.0)
         sub.separator()
 
         compute_device_list_get(None, context)
@@ -518,7 +528,7 @@ class BENCHMARK_PT_main(Panel):
 
         col = split.column()
         sub = col.row()
-        sub.scale_y = 64.0
+        sub.scale_y = ui_scale_factor(64.0)
         sub.separator()
 
         sub = col.row()