Operating system: Windows 10
Graphics card: Intel HD Graphics 515
Broken: b46245470f79, master, 2019-04-17, as found on the splash screen
Worked: New feature, not present in previous Blender versions.
Short description of error
Cannot confirm Line after drawing on Microsoft Surface (without keyboard and mouse).
There is no way to continue work when using line tool in environment without mouse and keyboard.
Menu is not responding while waiting to confirm/cancel Line tool.
There is no way to confirm/cancel line tool by pen/touch.
Exact steps for others to reproduce the error
Based on the default startup
Animation 2D as startup
Select the line tool by pen
Draw the line start point and end point
PS: Great work, the performance on my Microsoft Surface is great for Blender 2.80.