White Lines Appearing & Disappaaring All Over GUI in 8k screens

[Stargrazer82301]

Issue Report Checklist

• [X] Searched the issues page for similar reports
• [X Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• [X] Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• [X] Could not reproduce inside jupyter qtconsole (if console-related)
• [X] Tried basic troubleshooting (if a bug/error)
  • [X] Restarted Spyder
  • [X] Reset preferences with spyder --reset
  • [X] Reinstalled the latest version of Anaconda
  • [X] Tried the other applicable steps from the Troubleshooting Guide
• [X] Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

There are lots of little white lines that appear & disappear between GUI elements, as I move my mouse over the screen. It looks like perhaps some part of the highlighting visual effect is buggy? I have attached a couple of screenshots, with the little white lines highlighted. They're not not super obvious in the screenshots, but they are very distracting as dozens of them they continually appear & disappear all over the window as I move my mouse around the GUI.

I am using Spyder 5.1.1 on Mac Catalina.

What steps reproduce the problem?

1. Move mouse over GUI elements

What is the expected output? What do you see instead?

I would expect no little white lines to appear over GUI elements. As mentioned it seems like something is going wrong about how GUI elements are highlighted

Versions

• Spyder version: 5.1.1
• Python version: 3.7.1 64-Bit
• Qt version: 5.12.10
• PyQt version: 5.12.3
• Operating System name/version: MacOS Catalina 10.15.7

Dependencies

Mandatory:

applaunchservices >=0.1.7 : 0.2.1 (OK) atomicwrites >=1.2.0 : 1.4.0 (OK) chardet >=2.0.0 : 4.0.0 (OK) cloudpickle >=0.5.0 : 1.6.0 (OK) cookiecutter >=1.6.0 : 1.7.2 (OK) diff_match_patch >=20181111 : 20200713 (OK) intervaltree >=3.0.2 : 3.1.0 (OK) IPython >=7.6.0 : 7.24.1 (OK) jedi >=0.17.2;<0.19.0 : 0.17.2 (OK) jsonschema >=3.2.0 : 3.2.0 (OK) keyring >=17.0.0 : 23.0.1 (OK) nbconvert >=4.0 : 6.0.7 (OK) numpydoc >=0.6.0 : 1.1.0 (OK) parso >=0.7.0;<0.9.0 : 0.7.0 (OK) pexpect >=4.4.0 : 4.8.0 (OK) pickleshare >=0.4 : 0.7.5 (OK) psutil >=5.3 : 5.8.0 (OK) pygments >=2.0 : 2.9.0 (OK) pylint >=2.5.0 : 2.8.3 (OK) pyls_spyder >=0.4.0 : 0.4.0 (OK) pylsp >=1.2.1;<1.3.0 : 1.2.1 (OK) pylsp_black >=1.0.0 : None (OK) qdarkstyle =3.0.2 : 3.0.2 (OK) qstylizer >=0.1.10 : 0.1.10 (OK) qtawesome >=1.0.2 : 1.0.2 (OK) qtconsole >=5.1.0 : 5.1.0 (OK) qtpy >=1.5.0 : 1.9.0 (OK) rtree >=0.9.7 : 0.9.7 (OK) setuptools >=49.6.0 : 57.0.0 (OK) sphinx >=0.6.6 : 4.0.2 (OK) spyder_kernels >=2.1.0;<2.2.0 : 2.1.0 (OK) textdistance >=4.2.0 : 4.2.1 (OK) three_merge >=0.1.1 : 0.1.1 (OK) watchdog >=0.10.3 : 1.0.2 (OK) zmq >=17 : 22.1.0 (OK)

Optional:

cython >=0.21 : 0.29.15 (OK) matplotlib >=2.0.0 : 3.3.4 (OK) numpy >=1.7 : 1.17.3 (OK) pandas >=1.1.1 : 0.25.3 (NOK) scipy >=0.17.0 : 1.6.0 (OK) sympy >=0.7.3 : None (OK)

[ccordoba12]

Hey @Stargrazer82301, thanks for reporting. This could be caused because you're using a very high screen resolution.

Could you let us know what's your current screen resolution to check that?

[Stargrazer82301]

Hi; it is indeed a high-resolution screen, 5120x2880. Is there a Spyder setting I can change to remedy it?

[Stargrazer82301]

PS: Just checked, and I am also experiencing it on a 2560x1600 screen.

[ccordoba12]

Is there a Spyder setting I can change to remedy it?

No, there isn't, sorry. Also, I don't know how to fix this problem.

[tony-pythony]

I made a similar observation, except I've a 1080p screen & resolution set. When I use auto-dpi scaling, everything is fine, but the UI is to small for my old eyes and my big mouse. So, scaling spyder's UI to a ration of 1.12 makes working comfortable possible. But, I see, too, lines between Buttons (sometimes blinking irregularly), On texts, it looks like font-hinting isn't working properly (the part with window's ClearType also shows the same effect on ordinary windows software/texts/etc.. ) so I think it's the (auto) high-dpi scaling of Spyder leading to this. May be the scaling ratio is miscalculated somehow?

In my case setting the dpi-scaling to 1.125 (instead of 1.12) makes that effect go away. May be its good work around to try different scalings like 1.05 or 99.995??? But, yes.. its a kind of a bug with the rendering system.

Hope that helps a little bit, my friends. Thank you for investing you time & knowledge!

[Stargrazer82301]

Interesting. To test, I just tried setting my DPI scaling to 1.125, but I'm still seeing the lines. Odd that it should vary between systems like this.