Multi-line pasting is broken about upterm HOT 5 OPEN

@glyif I am ok, if you want to fix this. Sorry, but don't know, where exactly you need to start.

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#1301 (comment)

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@drusepth took a look, it looks like both the scanner and the parser are not taking into consideration the new line character.

@le0pard i would say this is a pretty big issue, thoughts?

i can take this bug, will get me more acquainted with upterm's shell. i would think it's using some type of operator-precedence parser for executing commands.

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This issue becomes annoying when you copy/paste long commands, like Docker UP with parameters separated by \ and a new line symbol.
IMHO critical
Reproduced on 0.4.4

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Any update on this? Just tried upterm for the first time, loved it immediately, then tried to copy/paste a multi-line command and was let down to see it not work. Pretty much renders it unusable and seems like it would be an easy enough thing to resolve (says the guy complaining but not offering to fix it).

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