Repository: spyder-ide/spyder

Issue:
Crashed while pressing backspace
## Description

### What steps will reproduce the problem?

<!--- You can use Markdown here --->

Making some conflict resolving and removed some line of code

### Traceback
```python-traceback
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\utils\editor.py", line 161, in _exec_requested_job
    self._job(*self._args, **self._kwargs)
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\panels\codefolding.py", line 426, in _highlight_block
    end_line = self.folding_regions[block_line]
KeyError: 64
```

## Versions

* Spyder version: 5.0.2 
* Python version: 3.7.9
* Qt version: 5.12.10
* PyQt5 version: 5.12.3
* Operating System: Windows 10

### Dependencies

```

# Mandatory:
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                  :  None (OK)
IPython >=7.6.0               :  7.23.1 (OK)
jedi =0.17.2                  :  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)
paramiko >=2.4.0              :  2.7.2 (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                  :  5.8.0 (OK)
pygments >=2.0                :  2.9.0 (OK)
pylint >=1.0                  :  2.8.2 (OK)
pyls >=0.36.2;<1.0.0          :  0.36.2 (OK)
pyls_black >=0.4.6            :  0.4.6 (OK)
pyls_spyder >=0.3.2;<0.4.0    :  0.3.2 (OK)
qdarkstyle =3.0.2             :  3.0.2 (OK)
qstylizer >=0.1.10            :  0.2.0 (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 >=0.8.3                 :  0.9.4 (OK)
setuptools >=39.0.0           :  56.2.0 (OK)
sphinx >=0.6.6                :  4.0.0 (OK)
spyder_kernels >=2.0.2;<2.1.0 :  2.0.2 (OK)
textdistance >=4.2.0          :  4.2.1 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog                      :  1.0.2 (OK)
zmq >=17                      :  22.0.3 (OK)

# Optional:
cython >=0.21                 :  0.29.23 (OK)
matplotlib >=2.0.0            :  3.4.2 (OK)
numpy >=1.7                   :  1.19.3 (OK)
pandas >=1.1.1                :  1.2.4 (OK)
scipy >=0.17.0                :  1.6.3 (OK)
sympy >=0.7.3                 :  1.8 (OK)
```



Discussion:

Resolving patch:
diff --git a/spyder/plugins/editor/utils/editor.py b/spyder/plugins/editor/utils/editor.py
--- a/spyder/plugins/editor/utils/editor.py
+++ b/spyder/plugins/editor/utils/editor.py
@@ -158,7 +158,13 @@ def cancel_requests(self):
     def _exec_requested_job(self):
         """Execute the requested job after the timer has timeout."""
         self._timer.stop()
-        self._job(*self._args, **self._kwargs)
+
+        try:
+            self._job(*self._args, **self._kwargs)
+        except KeyError:
+            # Catching the KeyError above is necessary to avoid
+            # issue spyder-ide/spyder#15712.
+            pass
 
 
 class TextHelper(object):


Test patch: