ToolBase::root_handler: fix keyboard movement for KEY_Up and KEY_Down events

Moving shape knots up and down with the keyboard moves them in the
opposite direction when the Y axis goes downwards.

This happens because commit 1fa0c72b66 (New option to invert y-axis,
2018-09-12) forgot to handle Y direction in src/ui/tools/tool-base.cpp.

Fix the issue by applying the Y axis direction factor just like it's
done in src/ui/tool/control-point-selection.cpp.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/ui/tools/tool-base.cpp b/src/ui/tools/tool-base.cpp
index 8637b640d..20aad1424 100644
--- a/src/ui/tools/tool-base.cpp
+++ b/src/ui/tools/tool-base.cpp
@@ -651,10 +651,10 @@ bool ToolBase::root_handler(GdkEvent* event) {
                         acceleration, desktop->getCanvas()));
 
                 gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
-                this->desktop->scroll_relative(Geom::Point(0, i));
+                this->desktop->scroll_relative(Geom::Point(0, -i * desktop->yaxisdir()));
                 ret = TRUE;
             } else {
-                ret = _keyboardMove(event->key, Geom::Point(0, 1));
+                ret = _keyboardMove(event->key, Geom::Point(0, -desktop->yaxisdir()));
             }
             break;
 
@@ -681,10 +681,10 @@ bool ToolBase::root_handler(GdkEvent* event) {
                         acceleration, desktop->getCanvas()));
 
                 gobble_key_events(get_latin_keyval(&event->key), GDK_CONTROL_MASK);
-                this->desktop->scroll_relative(Geom::Point(0, -i));
+                this->desktop->scroll_relative(Geom::Point(0, i * desktop->yaxisdir()));
                 ret = TRUE;
             } else {
-                ret = _keyboardMove(event->key, Geom::Point(0, -1));
+                ret = _keyboardMove(event->key, Geom::Point(0, desktop->yaxisdir()));
             }
             break;