**System Information**
Operating system: Windows 10, 64bit
Graphics card: none (CPU)
**Blender Version**
Broken: (v 2.82a) and also (v 2.83 Alpha, Date 2020-03-18 17:16, Hash c9c08dc7c873)
**Short description of error**
Possibly any operation in 3D Viewport jumps, if the mouse pointer crosses a corner (not only an edge) of the 3D Viewport window.
Typical scenario: I have zoomed in a lot to edit a detail, and I'm moving an object to the screen center using the `Move the view` tool. If my mouse cursor crosses the 3D Viewport window corner, the object jumps out of sight (disappears).
**Exact steps for others to reproduce the error**
- Start Blender
- Choose 2D Animation on the splash screen -> 2D Animation starts in camera view and draw mode
- Zoom out as far as possible -> so, you'll see things jump, and not just dissapear
- Enable Display Cursor (makes it easier to intentionally hit the corner) {F8415334}
- Press the `Move the view` tool to move the camera view.
- Drag the cursor across the window corner with reasonable speed (fast to easier hit the corner, slow to distinguish a jump from jerky mouse movement) {F8415349}
- It's not quite easy to exactly hit the window corner. I correct my motion, if I see the cursor pass in the top left or bottom right corner. With practice, I get a jump about every 10th time, I pass the corner. {F8415408}
- If a jump occurs, the (fully zoomed out) camera view suddenly jumps to one of the edges of the window.
Note:
This happens to me not only with `draw mode`, `camera view` and `Move the view` tool, but likely with any mode, view and tool of the 3D Viewport, that sometimes makes me cross the window corner. I did observe it using
- Move the view tool
- Zoom in/out the view tool
- G-key command to move things
in
- camera view
- 3d view
- draw mode
- edit mode
- maybe object mode