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Force the mark to point to the new dir, replacing the old one.

Fixes #7195

Changed aliases from
```
alias vsce='code --extensions-dir'
alias vsced='code --disable-extensions'
```
to
```
alias vsced='code --extensions-dir'
alias vscde='code --disable-extensions'
```

`vsce` is the command line to publish extensions:
https://code.visualstudio.com/docs/extensions/publish-extension

This commit triggers precmd and chpwd hook functions iff we changed directory.

This has the same behavior as zsh's hook function execution, which tries to run
the functions in the order specified and silently ignores any function that
does not exist.

See http://zsh.sourceforge.net/Doc/Release/Functions.html#Hook-Functions

Also moved duplicate nopushdminus logic to the `switch-to-dir` function.

Detect system Ruby in default `PATH`, and provide "system" completion if found.

Tested with [the Dockerfile](https://gist.github.com/franklinyu/b8deda6a5093a17b575679b5808b371f).

This commit fixes the runtime error that says:

  prompt_status:2: symbols: attempt to assign array value to non-array

It trips over a local array which is not properly declared.

This PR fixes the runtime error that displays this:

```log
prompt_status:2: symbols: attempt to assign array value to non-array
```.

It trips over a local array which is not properly declared.

Fixes the broken bottom "Logging" section of the table

The options for kdialog in KDE use double dashes

This change had the unintended consequence of overriding the functions to ensure
that application mode was set to use $terminfo sequences, introduced in #6449.

Fixes #7137

Remove Optional Static Type Checker's (mypy) cache files

Remove Optional Static Type Checker's (mypy) Cache Files on `pyclean`

Also fixed minor typo

Closes #6108
Co-authored-by: Matt <sifrawr@gmail.com>