Prevent accidental Tor Browser window maximizing

During Tails trainings with journalists, many are using Gnome for the first time and have a hard time getting accustomed to the way their laptop’s trackpad reacts to clicking/dragging speed and gesture mapping when they don’t match up with what they’re used to in macOS, Windows or ChromeOS. At every single training, without exception, at least one journalist has accidentally maximized Tor Browser when they meant to simply move the Tor Browser Window.

UX recommendations:

• Disable double-clicking as a trigger for maximizing/un-maximizing Tor Browser.
• Disable dragging to the top of the screen as a trigger for maximizing Tor Browser.

There may be some cases where one must intentionally maximize the Tor Browser window. In that case, the maximize window button in the application title bar should remain, as should the maximize option in the application context menu (when you right-click on the window list item in the bottom desktop bar).

There may be some concerns for setting a different set of interaction settings for just one application, which makes it less consistent from expected behaviors in other applications, but the risk associated with browser fingerprinting may outweigh that specific UX concern in this case.

Related issues

• Related to #14544

Original created by @huertanix on 15766 (Redmine)