bugfix for FY5253 case with bunched yearends

[jbrockmendel]

Also achieves coverage for one of the uncovered branches in FY5253.apply

• closes AssertionError in FY5253.rollback() #14774
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #18550 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #18550      +/-   ##
==========================================
- Coverage   91.35%   91.31%   -0.04%     
==========================================
  Files         164      164              
  Lines       49802    49804       +2     
==========================================
- Hits        45496    45478      -18     
- Misses       4306     4326      +20

Flag	Coverage Δ
#multiple	89.11% <100%> (-0.03%)	⬇️
#single	40.81% <0%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/tseries/offsets.py	96.98% <100%> (+0.08%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/plotting/_converter.py	63.44% <0%> (-1.82%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

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[codecov]

Codecov Report

Merging #18550 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #18550      +/-   ##
==========================================
- Coverage   91.59%   91.58%   -0.02%     
==========================================
  Files         153      153              
  Lines       51221    51223       +2     
==========================================
- Hits        46917    46911       -6     
- Misses       4304     4312       +8

Flag	Coverage Δ
#multiple	89.44% <100%> (ø)	⬆️
#single	40.67% <0%> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/tseries/offsets.py	96.94% <100%> (+0.08%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

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[jreback]

cc @cancan101 if you could have a look / try out.

[jreback]

release note pls.

[jbrockmendel]

Ping.

[jreback]

can you add from the OP: fy.rollback(pd.Timestamp('2003-12-31')) (which I think is the same result) as well

[jreback]

cc @ronif can you have a look.

[jbrockmendel]

Just rebased and pushed; no new changes.

[jreback]

thanks