RuntimeError when disconnecting monitors

[Cristianasp]

Issue Report Checklist

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

Problem Description

Having a second monitor conected to my notebook via HDMI and running spyder in this second monitor, if I disconnect the hdmi monitor I got a "Spyder has encountered an internal problem".

Spyder does not crashs but it opens a issue reporter. Message is:

File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted
Traceback (most recent call last):
File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted
Traceback (most recent call last):
File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted

What steps reproduce the problem?

1. Have a secondary monitor connected to your computer
2. Have spyder ruuning in the secondary monitor
3. Disconnect the HDMI monitor

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

Paste Traceback/Error Below (if applicable)

  File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
    self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted
Traceback (most recent call last):
  File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
    self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted
Traceback (most recent call last):
  File "/home/cristiana/anaconda3/envs/fintools/lib/python3.8/site-packages/spyder/app/mainwindow.py", line 1392, in handle_new_screen
    self.screen.logicalDotsPerInchChanged.disconnect(
RuntimeError: wrapped C/C++ object of type QScreen has been deleted

Versions

• Spyder version: 4.1.1
• Python version: 3.8.1
• Qt version:
• PyQt version:
• Operating System name/version: Ubuntu 18.04.4 LTS

Dependencies

PASTE DEPENDENCIES HERE

[ccordoba12]

Thanks a lot for reporting @Cristianasp! This came right on time before releasing 4.1.2.

@steff456, this is another easy one for you: please add RuntimeError next to to TypeError below:

spyder/spyder/app/mainwindow.py

Lines 1400 to 1405 in 31c2129

	try:
	self.screen.logicalDotsPerInchChanged.disconnect(
	self.show_dpi_change_message)
	except TypeError:
	# See spyder-ide/spyder#11903
	pass

[Cristianasp]

Glad to somehow contribute to this project @ccordoba12 !! :-)