Code permanently being hidden when removing lines from a folding zone and then folding it

[BPJones3D]

Description

What steps will reproduce the problem?

Step 1.

Create a block comment

Step 2.

Create a series of functions following the block comment, and collapse them.

Step 3.

In quick succession:
a. Add mulitple lines to the block comment
b. Collapsed the block comment

What should happen?

The program takes a second to update the lines that are represented to the collapsed code, and so if you add lines to above code, quickly, then collapse that block, the following lines should get hidden. Then will not be able to be unhidden once the lines are updated on the side-bar.

My code with the problem:

(all lines are uncollapsed, you can see the number gap between 71-208)
https://i.imgur.com/ejKmXTk.png

My code without the problem:

(you can see the 4 functions that are meant to occupy the space)
https://i.imgur.com/gBX2kHW.png

Versions

• Spyder version: 6.0.4 (standalone)
• Python version: 3.11.11 64-bit
• Qt version: 5.15.8
• PyQt5 version: 5.15.9
• Operating System: Windows-10-10.0.19045-SP0

Dependencies

# Mandatory:
aiohttp >=3.9.3                  :  3.11.12 (OK)
asyncssh >=2.14.0,<3.0.0         :  2.19.0 (OK)
atomicwrites >=1.2.0             :  1.4.1 (OK)
chardet >=2.0.0                  :  5.2.0 (OK)
cloudpickle >=0.5.0              :  3.1.1 (OK)
cookiecutter >=1.6.0             :  2.6.0 (OK)
diff_match_patch >=20181111      :  20241021 (OK)
github >=2.3.0                   :  2.5.0 (OK)
importlib_metadata >=4.6.0       :  8.6.1 (OK)
intervaltree >=3.0.2             :  3.1.0 (OK)
IPython >=8.13.0,<9.0.0,!=8.17.1 :  8.32.0 (OK)
jedi >=0.17.2,<0.20.0            :  0.19.2 (OK)
jellyfish >=0.7                  :  1.1.3 (OK)
jsonschema >=3.2.0               :  4.23.0 (OK)
keyring >=17.0.0                 :  25.6.0 (OK)
nbconvert >=4.0                  :  7.16.6 (OK)
numpydoc >=0.6.0                 :  1.8.0 (OK)
parso >=0.7.0,<0.9.0             :  0.8.4 (OK)
pexpect >=4.4.0                  :  4.9.0 (OK)
pickleshare >=0.4                :  0.7.5 (OK)
psutil >=5.3                     :  6.1.1 (OK)
pygments >=2.0                   :  2.19.1 (OK)
pylint >=3.1,<4                  :  3.3.4 (OK)
pylint_venv >=3.0.2              :  3.0.4 (OK)
pyls_spyder >=0.4.0              :  0.4.0 (OK)
pylsp >=1.12.0,<1.13.0           :  1.12.1 (OK)
pylsp_black >=2.0.0,<3.0.0       :  2.0.0 (OK)
pyuca >=1.2                      :  1.2 (OK)
qdarkstyle >=3.2.0,<3.3.0        :  3.2.3 (OK)
qstylizer >=0.2.2                :  0.2.4 (OK)
qtawesome >=1.3.1,<1.4.0         :  1.3.1 (OK)
qtconsole >=5.6.1,<5.7.0         :  5.6.1 (OK)
qtpy >=2.4.0                     :  2.4.2 (OK)
rtree >=0.9.7                    :  1.3.0 (OK)
setuptools >=49.6.0              :  75.8.0 (OK)
sphinx >=0.6.6                   :  8.1.3 (OK)
spyder_kernels >=3.0.3,<3.1.0    :  3.0.3 (OK)
superqt >=0.6.2,<1.0.0           :  0.7.0 (OK)
textdistance >=4.2.0             :  4.6.2 (OK)
three_merge >=0.1.1              :  0.1.1 (OK)
watchdog >=0.10.3                :  6.0.0 (OK)
yarl >=1.9.4                     :  1.18.3 (OK)
zmq >=24.0.0                     :  26.2.1 (OK)

# Optional:
cython >=0.21                    :  3.0.11 (OK)
matplotlib >=3.0.0               :  3.10.0 (OK)
numpy >=1.7                      :  2.2.2 (OK)
pandas >=1.1.1                   :  2.2.3 (OK)
scipy >=0.17.0                   :  1.15.1 (OK)
sympy >=0.7.3                    :  1.13.3 (OK)

[dalthviz]

Hi @BPJones3D thank you for the report! I think I was able to reproduce this. In my case to reproduce it I had to quickly not add but delete lines and only by repopening the file I was able to see again the code that got hidden:

We will try to check a fix for this in a future release 👍