Regression bug in the tab bar of the editor: the mouseover and selected highlights do not show properly

Problem Description

The mouseover and selected highlights in the tabbar of the editor are gone. I think this was introduced in PR #15124.

Versions

• Spyder version: 5.1.0.dev0 d005fce99
• Python version: 3.7.6 64-bit
• Qt version: 5.12.5
• PyQt5 version: 5.12.3
• Operating System: Windows 10

Dependencies

# Mandatory:
atomicwrites >=1.2.0          :  1.4.0 (OK)
chardet >=2.0.0               :  3.0.4 (OK)
cloudpickle >=0.5.0           :  1.5.0 (OK)
cookiecutter >=1.6.0          :  1.7.2 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree >=3.0.2          :  3.0.2 (OK)
IPython >=7.6.0               :  7.16.1 (OK)
jedi =0.17.2                  :  0.17.2 (OK)
jsonschema >=3.2.0            :  3.2.0 (OK)
keyring >=17.0.0              :  21.2.1 (OK)
nbconvert >=4.0               :  5.6.1 (OK)
numpydoc >=0.6.0              :  1.1.0 (OK)
paramiko >=2.4.0              :  2.7.1 (OK)
parso =0.7.0                  :  0.7.0 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.7.2 (OK)
pygments >=2.0                :  2.6.1 (OK)
pylint >=1.0                  :  2.5.3 (OK)
pyls >=0.36.2;<1.0.0          :  v5.0.1+1.gd005fce99 (NOK)
pyls_black >=0.4.6            :  0.4.6 (OK)
pyls_spyder >=0.3.2           :  0.3.2 (OK)
qdarkstyle =3.0.2             :  3.0.dev (NOK)
qstylizer >=0.1.10            :  0.1.10 (OK)
qtawesome >=1.0.2             :  1.1.0.dev0 (OK)
qtconsole >=5.0.3             :  5.0.3 (OK)
qtpy >=1.5.0                  :  1.9.0 (OK)
rtree >=0.8.3                 :  0.9.4 (OK)
setuptools >=39.0.0           :  49.6.0.post20210108 (OK)
sphinx >=0.6.6                :  3.1.2 (OK)
spyder_kernels >=2.0.1;<2.1.0 :  2.1.0.dev0 (OK)
textdistance >=4.2.0          :  4.2.0 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog >=0.10.3;<2.0.0      :  0.10.3 (OK)
zmq >=17                      :  19.0.1 (OK)

# Optional:
cython >=0.21                 :  0.29.21 (OK)
matplotlib >=2.0.0            :  3.2.1 (OK)
numpy >=1.7                   :  1.20.2 (OK)
pandas >=1.1.1                :  1.1.4 (OK)
scipy >=0.17.0                :  1.5.3 (OK)
sympy >=0.7.3                 :  None (NOK)

[jnsebgosselin]

@ccordoba12

Ok, so in order to reduce the number of variables, I just did a fresh install of Anaconda and installed Spyder dependencies in a fresh new Python 3.8 environment (instead of 3.7) with conda install -c spyder-ide/label/dev --file requirements\conda.txt.

Everything now looks fine, so I think we can safely close this issue, since the problem was most likely due to my environment which was kind of outdated.

[ccordoba12]

Great news @jnsebgosselin! Closing then.

I also think it was a problem on your end because no one else has reported it after we released 5.0