Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 560/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-16 17:10, hash: rB9742fa6668b1
Short description of error
When I rendering more then 1 image in same folder, I found that if you will have touch any file (filename) inside explorer - the main string will turn to red (it's normal), but at same time will occure a bug that change mouse position down to 1 string (and it save to all save-explorer menu folder). And it really anoing.
Maybe will be usefull: 1 - save menu always opens fullscreen, bacause I usual render big size images. 2 I use tablet (Wacom Intous Touch S)
Here is how it's looks like briefly: https://i.gyazo.com/a9f6df16ce40e492e4440f6db621dfa9.mp4
More closely with my explanation and thoughts what was the reason of this bug:
Exact steps for others to reproduce the error
And at some moment (usually it close to "5") you will see how render output image will slightly changed, like this: https://joxi.net/L21z04wuRV9klA.jpg
And that will be mean that bug appeared. And when you will open Save As (SHIFT+S) menu, you will find that cursor position shifted down to 1 string. And you can't normally type anything or select anything. Only when you will maimize windows - it will bring to normal.