Fix Python parser when chunk separators align

[Dreamsorcerer]

Fixes #3904.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (bb5be1b) to head (29a6655).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8720   +/-   ##
=======================================
  Coverage   98.13%   98.13%           
=======================================
  Files         107      107           
  Lines       33977    33986    +9     
  Branches     4022     4023    +1     
=======================================
+ Hits        33344    33353    +9     
  Misses        456      456           
  Partials      177      177           

Flag	Coverage Δ
CI-GHA	98.03% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.69% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.06% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.35% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.45% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.39% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.63% <100.00%> (+<0.01%)	⬆️
Py-3.12.4	97.73% <100.00%> (-0.01%)	⬇️
Py-3.8.10	95.68% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	97.18% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.32% <100.00%> (-0.01%)	⬇️
Py-3.9.19	97.27% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.88% <100.00%> (+<0.01%)	⬆️
VM-macos	97.35% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.69% <100.00%> (+<0.01%)	⬆️
VM-windows	96.06% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.10: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 6d3d1fc on top of patchback/backports/3.10/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720

Backporting merged PR #8720 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.10/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720 upstream/3.10

4. Now, cherry-pick PR Fix Python parser when chunk separators align #8720 contents into that branch:

   $ git cherry-pick -x 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd

   If it'll yell at you with something like fatal: Commit 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Fix Python parser when chunk separators align #8720 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.10/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.11: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 6d3d1fc on top of patchback/backports/3.11/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720

Backporting merged PR #8720 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.11/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720 upstream/3.11

4. Now, cherry-pick PR Fix Python parser when chunk separators align #8720 contents into that branch:

   $ git cherry-pick -x 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd

   If it'll yell at you with something like fatal: Commit 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 6d3d1fcf2583eb7b8330b194c00356ce169b2ebd

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Fix Python parser when chunk separators align #8720 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.11/6d3d1fcf2583eb7b8330b194c00356ce169b2ebd/pr-8720

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.