Another KeyError when folding regions

Description

What steps will reproduce the problem?

selected variable inspection window for a dataframe, then selected between another variable inspection window for a dict. Recieved an error about mismatch (or something between the two, don’t recall), and then returning to editor hit backspace a few times to delete and it crashed

Traceback

  File "C:\Users\nellypledge\anaconda3\lib\site-packages\spyder\plugins\editor\utils\editor.py", line 161, in _exec_requested_job
    self._job(*self._args, **self._kwargs)
  File "C:\Users\nellypledge\anaconda3\lib\site-packages\spyder\plugins\editor\panels\codefolding.py", line 451, in _highlight_block
    end_line = self.folding_regions[block_line]
KeyError: 67

Versions

• Spyder version: 4.1.3
• Python version: 3.7.7
• Qt version: 5.9.6
• PyQt5 version: 5.9.2
• 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            :  1.4.1 (OK)
diff_match_patch >=20181111    :  20181111 (OK)
intervaltree                   :  None (OK)
IPython >=4.0                  :  7.15.0 (OK)
jedi =0.15.2                   :  0.15.2 (OK)
nbconvert >=4.0                :  5.6.1 (OK)
numpydoc >=0.6.0               :  1.0.0 (OK)
paramiko >=2.4.0               :  2.7.1 (OK)
parso =0.5.2                   :  0.5.2 (OK)
pexpect >=4.4.0                :  4.8.0 (OK)
pickleshare >=0.4              :  0.7.5 (OK)
psutil >=5.3                   :  5.7.0 (OK)
pygments >=2.0                 :  2.6.1 (OK)
pylint >=0.25                  :  2.4.4 (OK)
pyls >=0.31.9;<0.32.0          :  0.31.10 (OK)
qdarkstyle >=2.8               :  2.8.1 (OK)
qtawesome >=0.5.7              :  0.7.2 (OK)
qtconsole >=4.6.0              :  4.7.5 (OK)
qtpy >=1.5.0                   :  1.9.0 (OK)
rtree >=0.8.3                  :  0.9.4 (OK)
sphinx >=0.6.6                 :  3.1.1 (OK)
spyder_kernels >=1.9.1;<1.10.0 :  1.9.1 (OK)
watchdog                       :  None (OK)
zmq >=17                       :  19.0.1 (OK)

# Optional:
cython >=0.21                  :  0.29.20 (OK)
matplotlib >=2.0.0             :  3.2.2 (OK)
numpy >=1.7                    :  1.18.5 (OK)
pandas >=0.13.1                :  1.0.5 (OK)
scipy >=0.17.0                 :  1.5.0 (OK)
sympy >=0.7.3                  :  1.6 (OK)

[nranthony]

Cool, thanks for your time on these things. I’ll convey anything that happens that might be helpful.

[ccordoba12]

This is kind of strange what do you think @ccordoba12 ?

Although perhaps there’s no easy way to reproduce this, it can still happen because #11310 added a try/except around _highlight_runner, but there are other calls to _highlight_block in codefolding.py that are not protected by that.

@steff456, please add a try/except KeyError around those other calls to _highlight_block in that file.