[gimp] app: fix GimpToolCompass for one perfectly vertical line

[Michael Natterer <mitch src gnome org>]

commit 5da3bdb4eabc1f6938432b640299b3b97f6eea09
Author: Michael Natterer <mitch gimp org>
Date:   Sun Jan 28 15:24:29 2018 +0100

    app: fix GimpToolCompass for one perfectly vertical line
    
    the angle arc and the small helper line were displayed on opposite
    sides of the first point. Now they are on the same side, just like for
    all other angles.

 app/display/gimptoolcompass.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/display/gimptoolcompass.c b/app/display/gimptoolcompass.c
index 1abb50f..191ceba 100644
--- a/app/display/gimptoolcompass.c
+++ b/app/display/gimptoolcompass.c
@@ -519,7 +519,7 @@ gimp_tool_compass_changed (GimpToolWidget *widget)
   gimp_canvas_line_set (private->angle_line,
                         private->x[0],
                         private->y[0],
-                        private->x[0] + (private->x[1] >= private->x[0] ?
+                        private->x[0] + (private->x[1] > private->x[0] ?
                                           (arc_radius + target) :
                                          -(arc_radius + target)),
                         private->y[0]);