Allow the Snippet285 to be moved with the mouse

[fedejeanne]

It closes with the "esc" key, as many other snippets do

[github-actions[bot]]

Test Results

   458 files  ±0     458 suites  ±0   8m 20s :stopwatch: +8s  4 130 tests ±0   4 122 :white_check_mark: ±0   8 :zzz: ±0  0 :x: ±0  16 325 runs  ±0  16 233 :white_check_mark: ±0  92 :zzz: ±0  0 :x: ±0 

Results for commit 1fc00249. ± Comparison against base commit f634e245.