Use nearest with mipmaps texture filter in SpriteFrames editor plugin

editor/plugins/sprite_frames_editor_plugin.cpp

@@ -1705,6 +1705,7 @@ SpriteFramesEditor::SpriteFramesEditor() {
 	frame_list = memnew(ItemList);
 	frame_list->set_v_size_flags(SIZE_EXPAND_FILL);
 	frame_list->set_icon_mode(ItemList::ICON_MODE_TOP);
+	frame_list->set_texture_filter(TEXTURE_FILTER_NEAREST_WITH_MIPMAPS);
 
 	frame_list->set_max_columns(0);
 	frame_list->set_icon_mode(ItemList::ICON_MODE_TOP);
@@ -1853,6 +1854,7 @@ SpriteFramesEditor::SpriteFramesEditor() {
 
 	split_sheet_preview = memnew(TextureRect);
 	split_sheet_preview->set_expand_mode(TextureRect::EXPAND_IGNORE_SIZE);
+	split_sheet_preview->set_texture_filter(TEXTURE_FILTER_NEAREST_WITH_MIPMAPS);
 	split_sheet_preview->set_mouse_filter(MOUSE_FILTER_PASS);
 	split_sheet_preview->connect("draw", callable_mp(this, &SpriteFramesEditor::_sheet_preview_draw));
 	split_sheet_preview->connect("gui_input", callable_mp(this, &SpriteFramesEditor::_sheet_preview_input));