UI: Add an outer boundary for edge panning, use in outliner

Currently if you drag and drop an item from the outliner elsewhere in
the Blender window, the outliner will scroll the entire time, even if the
mouse is far away. This commit adds optional behavior for the edge pan
operator that makes it only act if the mouse is close enough to the region.

Differential Revision: https://developer.blender.org/D8193

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_rect.h b/source/blender/blenlib/BLI_rect.h
index b1faae03583..14d18308ed6 100644
--- a/source/blender/blenlib/BLI_rect.h
+++ b/source/blender/blenlib/BLI_rect.h
@@ -63,6 +63,7 @@ void BLI_rcti_translate(struct rcti *rect, int x, int y);
 void BLI_rcti_recenter(struct rcti *rect, int x, int y);
 void BLI_rctf_recenter(struct rctf *rect, float x, float y);
 void BLI_rcti_resize(struct rcti *rect, int x, int y);
+void BLI_rcti_pad(struct rcti *rect, int pad_x, int pad_y);
 void BLI_rctf_resize(struct rctf *rect, float x, float y);
 void BLI_rcti_scale(rcti *rect, const float scale);
 void BLI_rctf_scale(rctf *rect, const float scale);