LoopTools: Gstretch fix.

Grease pencil must have name 'GPencil'.
Script take only the first strokes.

mesh_looptools.py

@@ -61,7 +61,7 @@ looptools_cache = {}
 
 
 def get_grease_pencil(object, context):
-    gp = bpy.data.grease_pencils
+    gp = bpy.context.scene.objects['GPencil']
     if not gp:
         gp = context.view_layers.grease_pencils
     return gp
@@ -2843,13 +2843,13 @@ def gstretch_get_strokes(object, context):
     gp = get_grease_pencil(object, context)
     if not gp:
         return(None)
-    layer = context.active_gpencil_layer
+    layer = gp.data.layers[0]
     if not layer:
         return(None)
-    frame = context.active_gpencil_frame
+    frame = layer.frames[0]
     if not frame:
         return(None)
-    strokes = context.editable_gpencil_strokes
+    strokes = frame.strokes
     if len(strokes) < 1:
         return(None)
 
@@ -3828,8 +3828,15 @@ class RemoveGP(Operator):
 
     def execute(self, context):
 
-        if context.gpencil_data is not None:
-            bpy.ops.gpencil.data_unlink()
+        gp = bpy.context.scene.objects['GPencil']
+        if len(gp.data.layers[0].frames) is not 0:
+            bpy.ops.object.mode_set(mode='OBJECT')
+            bpy.ops.object.select_all('INVOKE_REGION_WIN', action='DESELECT')
+            gp.select_set(True)
+            bpy.context.view_layer.objects.active = gp
+            bpy.ops.object.mode_set(mode='PAINT_GPENCIL')
+            bpy.ops.gpencil.active_frame_delete('INVOKE_REGION_WIN')
+            bpy.ops.object.mode_set(mode='OBJECT')
         else:
             self.report({'INFO'}, "No Grease Pencil data to Unlink")
             return {'CANCELLED'}