"Run selected text in active terminal" doesn't work on moderate text amounts

[gowerc]

• VSCode Version: 1.44.2
• OS Version: OSX Mojave

Steps to Reproduce:

Using "Run selected text in active terminal" on a moderate amount of text doesn't work. In particular, it seems to lose some of the text that is being sent by around lines 30-40 (it is not consistent which lines are affected)

1. Open a file
2. Open an integrated terminal
3. Copy the following lines of code into the file

echo "hello, world"  # 001 
echo "hello, world"  # 002 
echo "hello, world"  # 003 
echo "hello, world"  # 004 
echo "hello, world"  # 005 
echo "hello, world"  # 006 
echo "hello, world"  # 007 
echo "hello, world"  # 008 
echo "hello, world"  # 009 
echo "hello, world"  # 010 
echo "hello, world"  # 011 
echo "hello, world"  # 012 
echo "hello, world"  # 013 
echo "hello, world"  # 014 
echo "hello, world"  # 015 
echo "hello, world"  # 016 
echo "hello, world"  # 017 
echo "hello, world"  # 018 
echo "hello, world"  # 019 
echo "hello, world"  # 020 
echo "hello, world"  # 021 
echo "hello, world"  # 022 
echo "hello, world"  # 023 
echo "hello, world"  # 024 
echo "hello, world"  # 025 
echo "hello, world"  # 026 
echo "hello, world"  # 027 
echo "hello, world"  # 028 
echo "hello, world"  # 029 
echo "hello, world"  # 030 
echo "hello, world"  # 031 
echo "hello, world"  # 032 
echo "hello, world"  # 033 
echo "hello, world"  # 034 
echo "hello, world"  # 035 
echo "hello, world"  # 036 
echo "hello, world"  # 037 
echo "hello, world"  # 038 
echo "hello, world"  # 039 
echo "hello, world"  # 040 
echo "hello, world"  # 041 
echo "hello, world"  # 042 
echo "hello, world"  # 043 
echo "hello, world"  # 044 
echo "hello, world"  # 045 
echo "hello, world"  # 046 
echo "hello, world"  # 047 
echo "hello, world"  # 048 
echo "hello, world"  # 049 
echo "hello, world"  # 050 

4. Select all of the above text
5. Use "run selected text in active terminal

Up untill around line 30-40 it will work as expected but then from then onwards there is a high chance of seeing some strange results for example:

<snipped for brevity>

~/Desktop
❯ echo "hello, world"  # 032 
hello, world

~/Desktop
❯ echo "hello, world"  # 033 
hello, world

~/Desktop
❯ echo "hello, world"  # 034 
hello, world

~/Desktop
❯ echo "hello, world"  # 035 
hello, world

~/Desktop
❯ echo "hello, world"  # 036 
hello, world

~/Desktop
❯ echo "hello, world"  # 037 
hello, world

~/Desktop
❯ echo "hello, worecho "hello, wor "hello, worecho "hello, worecho "helworecho "hello, who "hello, worecho "hello, worechollo, world"  # 042 
dquote… ❯ echo "hello, world"  # 043 
dquote… ❯ echo "hello, world"  # 044 
dquote… ❯ echo "hello, worecho "hello, worechollo, world"  # 046 
hello, worecho hello, wor hello, worecho hello, worecho helworecho hello, who hello, worecho hello, worechollo, world  # 042 
echo hello, world  # 043 
echo hello, world  # 044 
echo hello, worecho hello, worechollo, world

Does this issue occur when all extensions are disabled?: Yes

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Undo multi cursor edit corrupts document (#93585)

[Tyriar]

/duplicate #87183