UI: Remove Panel Grid Snapping While Dragging

The reason to have this isn't quite clear, but it looks like a vestige
of the 2.5 transition. Removing this makes dragging panels feel
much more responsive.

Thanks to Julian Eisel @Severin for the original change.

Differential Revision: https://developer.blender.org/D7803

2 files changed, 2 insertions, 3 deletions

diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index 3748dbab519..5b68ccf9e7c 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -105,7 +105,6 @@ extern const char ui_radial_dir_to_numpad[8];
 extern const short ui_radial_dir_to_angle[8];
 
 /* internal panel drawing defines */
-#define PNL_GRID (UI_UNIT_Y / 5)     /* 4 default */
 #define PNL_HEADER (UI_UNIT_Y * 1.2) /* 24 default */
 
 /* bit button defines */
diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.c
index 04179721305..c5f67e63bd3 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.c
@@ -1322,8 +1322,8 @@ static void ui_do_drag(const bContext *C, const wmEvent *event, Panel *panel)
     return;
   }
 
-  dx = (event->x - data->startx) & ~(PNL_GRID - 1);
-  dy = (event->y - data->starty) & ~(PNL_GRID - 1);
+  dx = (event->x - data->startx);
+  dy = (event->y - data->starty);
 
   dx *= (float)BLI_rctf_size_x(&region->v2d.cur) / (float)BLI_rcti_size_x(&region->winrct);
   dy *= (float)BLI_rctf_size_y(&region->v2d.cur) / (float)BLI_rcti_size_y(&region->winrct);