when drawing notes, the grid should be scaled to the zoom scale

this prevents the case where have enabled snap, and you add a note that
 appears to be on a bar line. but actually it is {some Grid value} off,
 it just looks right because of pixel rounding.

gtk2_ardour/editor_drag.cc

@@ -6839,7 +6839,9 @@ NoteCreateDrag::~NoteCreateDrag ()
 Temporal::Beats
 NoteCreateDrag::round_down_to_grid (timepos_t const & pos, GdkEvent const * event) const
 {
-	return _editor->snap_to_bbt (pos, RoundDownMaybe, SnapToGrid_Unscaled).beats ();
+	timepos_t snapped = pos;
+	_editor->snap_to (snapped, RoundDownMaybe, SnapToGrid_Scaled);
+	return snapped.beats();
 }
 
 void
@@ -6881,6 +6883,10 @@ NoteCreateDrag::motion (GdkEvent* event, bool)
 	const timepos_t pos = _drags->current_pointer_time ();
 	Temporal::Beats aligned_beats = round_down_to_grid (pos, event);
 
+	//when the user clicks and starts a drag to define the note's length, require notes to be at least |this| long
+	const Temporal::Beats min_length (_region_view->get_draw_length_beats (pos));
+	aligned_beats = aligned_beats+min_length;
+
 	_note[1] = timepos_t (max (Temporal::Beats(), aligned_beats));
 
 	const timepos_t rrp1 (_region_view->region()->region_relative_position (_note[0]));
@@ -6902,13 +6908,6 @@ NoteCreateDrag::finished (GdkEvent* ev, bool had_movement)
 	Beats const start = _region_view->region()->absolute_time_to_region_beats (min (_note[0], _note[1]));
 	Beats length = max (Beats (0, 1), (_note[0].distance (_note[1]).abs().beats()));
 
-	GridType grid_to_use = _editor->draw_length() == DRAW_LEN_AUTO ? _editor->grid_type() : _editor->draw_length();
-	int32_t div = _editor->get_grid_music_divisions (grid_to_use, ev->button.state);
-
-	if (div > 0) {
-		length = length.round_to_subdivision (div, RoundUpMaybe);
-	}
-
 	/* create_note_at() implements UNDO for us */
 	_region_view->create_note_at (timepos_t (start), _drag_rect->y0(), length, ev->button.state, false);
 }

gtk2_ardour/midi_region_view.cc

@@ -4092,7 +4092,8 @@ MidiRegionView::update_ghost_note (double x, double y, uint32_t state)
 	PublicEditor& editor = trackview.editor ();
 
 	samplepos_t const unsnapped_sample = editor.pixel_to_sample (global_x);
-	const Temporal::timepos_t snapped_pos = editor.snap_to_bbt (timepos_t (unsnapped_sample), RoundDownAlways, SnapToGrid_Unscaled);
+	Temporal::timepos_t snapped_pos = timepos_t (unsnapped_sample);
+	editor.snap_to (snapped_pos, RoundDownAlways, SnapToGrid_Scaled);
 	const Temporal::Beats snapped_beats = _region->position().distance (snapped_pos).beats ();
 
 	/* prevent Percussive mode from displaying a ghost hit at region end */