Added support for setting the current animation frame (#3681)

esphome/components/display/display_buffer.cpp

@@ -591,6 +591,18 @@ void Animation::prev_frame() {
   }
 }
 
+void Animation::set_frame(int frame) {
+  unsigned abs_frame = abs(frame);
+
+  if (abs_frame < this->animation_frame_count_) {
+    if (frame >= 0) {
+      this->current_frame_ = frame;
+    } else {
+      this->current_frame_ = this->animation_frame_count_ - abs_frame;
+    }
+  }
+}
+
 DisplayPage::DisplayPage(display_writer_t writer) : writer_(std::move(writer)) {}
 void DisplayPage::show() { this->parent_->show_page(this); }
 void DisplayPage::show_next() { this->next_->show(); }