Feature/get pre canvas #281

Merged d-matsuura merged 5 commits into nitta-lab-2021:master from nitta-lab-2021:feature/get_pre_canvas on 4 Nov 2021

2021-11-04	14fb78d Browse files » [update]edited page thumbnail k-fujii committed on 4 Nov 2021
2021-11-02	ec15399 Browse files » [update]一応前のキャンバスを薄く表示できるように。サーバーに置かれた画像のバグを修正 k-fujii committed on 2 Nov 2021
	f0a975b Browse files » [update]マスターを吸ってます k-fujii committed on 2 Nov 2021
	98d1ba7 Browse files » Merge branch 'master' into feature/get_pre_canvas ... # Conflicts: # app/src/main/java/org/ntlab/acanthus_client/views/paint/PaintActivity.java k-fujii committed on 2 Nov 2021
	2f09629 Browse files » [update]一時退避 k-fujii committed on 2 Nov 2021