Surprising `Axes.__init__` default values

Nobody has claimed this yet.

## Description of bug / unexpected behavior

When using `Axes`, knowing that the defaults for `x_length` and `y_length` are based upon the values of `config.frame_width` and `config.frame_height`, I set the latter two to a square: 15x15

The resulting `Axes` class had as its defaults values based upon the `config.frame_*` _defaults_, meaning that despite setting these in my code, the parse-time defaults of 14.2 and 8.0 were used.

This is only a "bug" in the sense that the behavior is confusing. I could well be abusing the config system by setting these values in my scripts...

I believe a better behavior would be to test for `None`-ness _inside of init_ so the "current" (from the script's timeline point of view) values of `config.frame_` are used to calculate the defaults.

## Expected behavior

I expected the resulting `Axes.*_length` values to be 13x13 (15-2).

## How to reproduce the issue

Code for reproducing the problem

I changed the `round` calls in the `Axes.__init__` to be `dround` and created a wrapper function that prints the values of `config.frame_*` and added print statements inside of `__init__` to print the values of `self.*_length`. Here are the changes.

Note that this is daf23c9d1031b12d9c119b8f6b7e60727d7f9242 / aka 0.14.0

```diff
$ git diff manim/mobject/coordinate_systems.py
diff --git a/manim/mobject/coordinate_systems.py b/manim/mobject/coordinate_systems.py
index 0a402f26..7083c877 100644
--- a/manim/mobject/coordinate_systems.py
+++ b/manim/mobject/coordinate_systems.py
@@ -12,6 +12,11 @@ __all__ = [
"ComplexPlane",
]

+def dround(value):
+ print("Value of config.frame_height when Axes.__init__ parsed: %s" % config.frame_height)
+ print("Value of config.frame_width when Axes.__init__ parsed: %s" % config.frame_width)
+ return round(value)
+
import fractions as fr
import numbers
from typing import Any, Callable, Dict, Iterable, List, Optional, Sequence, Tuple, Union
@@ -1752,8 +1757,8 @@ class Axes(VGroup, CoordinateSystem, metaclass=ConvertToOpenGL):
self,
x_range: Sequence[float] | None = None,
y_range: Sequence[float] | None = None,
- x_length: float | None = round(config.frame_width) - 2,
- y_length: float | None = round(config.frame_height) - 2,
+ x_length: float | None = dround(config.frame_width) - 2,
+ y_length: float | None = dround(config.frame_height) - 2,
axis_config: dict | None = None,
x_axis_config: dict | None = None,
y_axis_config: dict | None = None,
@@ -1763,6 +1768,9 @@ class Axes(VGroup, CoordinateSystem, metaclass=ConvertToOpenGL):
VGroup.__init__(self, **kwargs)
CoordinateSystem.__init__(self, x_range, y_range, x_length, y_length)

+ print("Value of self.y_length when I actually *call* Axes.__init__: %s" % self.y_length)
+ print("Value of self.x_length when I actually *call* Axes.__init__: %s" % self.x_length)
+
self.axis_config = {
"include_tip": tips,
```

I then ran the following script

```py

print("About to import manim...")
from manim import *
print("...manim has been imported")

config.frame_height = 15
config.frame_width = 15

print("Value of config.frame_height when I use my script: %s" % config.frame_height)
print("Value of config.frame_width when I use my script: %s" % config.frame_width)

axes = Axes()

print("")
print("Value of axes.y_length when I actually *call* Axes.__init__: %s" % axes.y_length)
print("Value of axes.x_length when I actually *call* Axes.__init__: %s" % axes.x_length)
```

Which prints the following:

```
About to import manim...
Value of config.frame_height when Axes.__init__ parsed: 8.0
Value of config.frame_width when Axes.__init__ parsed: 14.222222222222221
Value of config.frame_height when Axes.__init__ parsed: 8.0
Value of config.frame_width when Axes.__init__ parsed: 14.222222222222221
Manim Community v0.14.0

...manim has been imported
Value of config.frame_height when I use my script: 15
Value of config.frame_width when I use my script: 15
Value of self.y_length when I actually *call* Axes.__init__: 6
Value of self.x_length when I actually *call* Axes.__init__: 12

Value of axes.y_length when I actually *call* Axes.__init__: 6
Value of axes.x_length when I actually *call* Axes.__init__: 12
```

(Not sure why only importing causes two passes...)

If I make these changes:

```diff
diff --git a/manim/mobject/coordinate_systems.py b/manim/mobject/coordinate_systems.py
index 0a402f26..66e2d2fb 100644
--- a/manim/mobject/coordinate_systems.py
+++ b/manim/mobject/coordinate_systems.py
@@ -1752,14 +1752,17 @@ class Axes(VGroup, CoordinateSystem, metaclass=ConvertToOpenGL):
self,
x_range: Sequence[float] | None = None,
y_range: Sequence[float] | None = None,
- x_length: float | None = round(config.frame_width) - 2,
- y_length: float | None = round(config.frame_height) - 2,
+ x_length: float | None = None,
+ y_length: float | None = None,
axis_config: dict | None = None,
x_axis_config: dict | None = None,
y_axis_config: dict | None = None,
tips: bool = True,
**kwargs,
):
+ x_length = round(config.frame_width) - 2 if x_length is None else x_length
+ y_length = round(config.frame_width) - 2 if y_length is None else y_length
+
VGroup.__init__(self, **kwargs)
CoordinateSystem.__init__(self, x_range, y_range, x_length, y_length)

```

...then the above script prints...

```
About to import manim...
Manim Community v0.14.0

...manim has been imported
Value of config.frame_height when I use my script: 15
Value of config.frame_width when I use my script: 15

Value of axes.y_length when I actually *call* Axes.__init__: 13
Value of axes.x_length when I actually *call* Axes.__init__: 13
```

## Additional media files

Images/GIFs

## Logs
Terminal output

```
PASTE HERE OR PROVIDE LINK TO https://pastebin.com/ OR SIMILAR
```

## System specifications

System Details

- OS (with version, e.g Windows 10 v2004 or macOS 10.15 (Catalina)): OSX Big Sur 11.6.2 (20G314)
- RAM:
- Python version (`python/py/python3 --version`): 3.9.9
- Installed modules (provide output from `pip list`):
```
Package Version Editable project location
------------------------------------------------- ------------- ---------------------------
aiohttp 3.8.1
aiosignal 1.2.0
alabaster 0.7.12
apipkg 1.5
appdirs 1.4.4
appnope 0.1.2
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async-timeout 4.0.1
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attrs 21.2.0
Babel 2.9.1
backcall 0.2.0
base58 2.1.1
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black 21.11b1
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cachetools 4.2.4
certifi 2021.10.8
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chardet 4.0.0
charset-normalizer 2.0.9
click 8.0.3
click-default-group 1.2.2
cloup 0.7.1
colorama 0.4.4
colour 0.1.5
commonmark 0.9.1
cryptography 3.4.7
Cython 0.29.26
cytoolz 0.11.2
dataclassy 0.11.1
decorator 5.0.9
docutils 0.17.1
eip712 0.1.0
eth-abi 2.1.1
eth-account 0.5.6
eth-bloom 1.0.4
eth-brownie 1.17.2 /Users/mburr/git/brownie
eth-event 1.2.3
eth-hash 0.3.2
eth-keyfile 0.5.1
eth-keys 0.3.3
eth-rlp 0.2.1
eth-tester 0.6.0b4
eth-typing 2.2.2
eth-utils 1.10.0
execnet 1.9.0
frozenlist 1.2.0
gitdb 4.0.9
GitPython 3.1.26
glcontext 2.3.4
google-api-core 2.3.2
google-auth 2.3.3
google-cloud-texttospeech 2.9.0
googleapis-common-protos 1.54.0
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hypothesis 6.27.3
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inflection 0.5.0
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ipdb 0.13.9
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jedi 0.18.0
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jsonschema 3.2.0
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lru-dict 1.1.7
manim 0.14.0
ManimPango 0.4.0.post0
mapbox-earcut 0.12.11
MarkupSafe 2.0.1
MathChurch 0.0.11 /Users/mburr/git/MathChurch
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numpy 1.22.0
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pip 21.3.1
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```

LaTeX details

+ LaTeX distribution (e.g. TeX Live 2020):
+ Installed LaTeX packages:

FFMPEG

Output of `ffmpeg -version`:

```
PASTE HERE
```

## Additional comments

Start in manim/mobject/coordinate_systems.py at Axes.__init__, where the default x_length and y_length values are defined. Reproduce the issue by setting config.frame_width and config.frame_height before creating Axes, then verify that omitted lengths reflect those current values while explicit lengths remain unchanged.

Written by the indexing model from the issue text.