IIRC there have been several instances of glocks being dropped and discharging, and many instances discharge upon holstering and draw.
My friend retired from Smith & Wesson about ten years ago. According to him when Glock came on the scene many departments began switching to Glock because Glock nearly gave away the guns to the departments. When that happened, the rates of accidental discharge began to rise. Glocks are not all they a billed out to be. I personally, don't like the design. Rappers and Hollywood are the real credit to the Glocks popularity.
You can call an accidental discharge anything you want. Rules of gun safety always apply, but not every time do things go as planed, humans make mistakes. Not every time a gun is pulled does the round need to be fired, if the round exits the chamber when it did not need to then harm may be done. Glock has been sued many times about this design.
Generally I see people who love Glocks or the hate them. I am in the hate group. I never liked them from the first one I held. Many better designs are out there. I happen to be a 1911 fan.
John Browning designed a better gun nearly 100 years before. Sorry if I offended the god of Glock.