Fix T102163: GPencil:Set start point Operator make stroke deleted

There were two problems:

* The stroke was deleted if the last point was selected. Now
the stroke is flipped because is faster.

* If the second point was selected, the first point was removed
because the internal api, removed one point strokes by
default.  This was done becaus ethe tools that used this API
did not need one point strokes as result. Now this optional 
and keep one point strokes.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/editors/gpencil/gpencil_edit.c b/source/blender/editors/gpencil/gpencil_edit.c
index 6181b9810e3..66f86a3e0c1 100644
--- a/source/blender/editors/gpencil/gpencil_edit.c
+++ b/source/blender/editors/gpencil/gpencil_edit.c
@@ -3848,7 +3848,12 @@ static int gpencil_stroke_start_set_exec(bContext *C, wmOperator *op)
             for (int i = 0; i < gps->totpoints; i++) {
               pt = &gps->points[i];
               if (pt->flag & GP_SPOINT_SELECT) {
-                BKE_gpencil_stroke_start_set(gps, i);
+                if (i == gps->totpoints - 1) {
+                  BKE_gpencil_stroke_flip(gps);
+                }
+                else {
+                  BKE_gpencil_stroke_start_set(gps, i);
+                }
                 BKE_gpencil_stroke_geometry_update(gpd, gps);
                 changed = true;
                 break;