[Midnight Commander] #4471: MTP +…+ sub-shell = sudden change of a location, and combined issues with no '\n'

[Ticket System]

#4471: MTP +…+ sub-shell = sudden change of a location, and combined issues with
no '\n'
--------------------------+-------------------------------
Reporter: ukr | Type: defect
Status: new | Priority: major
Milestone: | Component: mc-core
Version: master | Keywords: mtp
Blocked By: | Blocking:
Branch state: no branch | Votes for changeset:
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0) Connect your Android (an `mtp` device) via USB to your host (tap to
enable `transfer files` if needed).
1) Mount your `mtp` device with something like `gio mount
"mtp://[usb:002,011]/"` or ensure your device is auto-mounted.
2) Left panel: open you mounted Android (usually in
`/run/user/1000/gvfs`); right panel: open any local location.
3) Find and copy something from your Android (e.g. any `*.jpg`) to your
local location.
4) Try to open you copied local file by pressing `Enter` on it:
- `The shell is already running a command` (in fact it does not)
5) Change on the left panel to something non-mtp (e.g. any local location
from your history), and try to open file again on the right side.
- it either opens (see towards the end of this ticket) or not.
5.1) Try `Ctrl+O` twice.
- the location on the **right** side suddenly changes to your previous
`mtp` location from the //**left**// side. Perhaps, a hint on the cause.
5.2) On the left side, move back (e.g. through you history) to your actual
//local// location. Try to open (press `Enter`) the same file.
- it opens OK.

*) Work around the issue: always ensure changing to local locations on
both panels twice. The issue is somewhat related to the local sub-shell
implementation, most noticeable by pressing `Ctrl+O` (it doesn't also send
`\n`, so the prompt may be garbled or continued).
[[BR]]

^*. I am off for good and cannot provide further description which is why
I did my best to put the issue on the notice board for further reference.^

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Ticket URL: <http://www.midnight-commander.org/ticket/4471>
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