BACKENDS: iOS: Default touchpad mode unusable on iOS 16

[dwatteau]

larsman on Discord asked to file a bug report about this.

I'm not a regular user of the iOS port, but it's been reported that the default iOS controls (i.e. "touchpad mode") became unusable since iOS 16 was released.

(At first we thought it could be related to ​https://9to5mac.com/2022/09/15/ios-16-bug-three-finger-games/ but upgrading to iOS 16.1 didn't solve the issue.)

I can confirm this with iOS 16.1 running on an iPhone 8 Plus (built with Xcode 14 and just following our iOS build documentation, on current Git HEAD):

• the (default) "touchpad mode" controls are almost unusable: whenever you do a single-tap somewhere, the cursor will move away by a significant amount, and so it's almost impossible to hit any button or do any point-n-click action (as if using a really poor touchscreen)
• "Non-touchpad mode, mouse, Magic Keyboard and game controllers seems to work properly" (larsman)

Unfortunately, my only iOS device has been updated to iOS 16 and so I can't test iOS 15 back to confirm whether this is an iOS 15 => 16 regression. I can't reproduce this issue in the Xcode iPhone simulator, though.

[larsamannen]

I’ll have a look at it.

[larsamannen]

This is fixed by following commit:
​https://github.com/scummvm/scummvm/commit/f76cf2195ee368b4a1571c34d429783a3c853350

Ok to close.

[dwatteau]

Thanks!