Join lines should not add a space (" ") character between joined lines

[DanKaplanSES]

In this GIF, I join two lines and highlight a space that was added between them.

Here's my feature request: Don't add an extra space when joining lines.

Note: vim adds this space, intellij IDEA does not. IMHO, intellij IDEA's way is more useful and more flexible:

1. If a space delimiter is desired:
   1. It's trivial to modify the original text prior to "join lines" to add spaces at the end of every line.
2. If no delimiter is desired:
   1. vimscript can customize the join command to automatically remove the space it appends. The same can't be done in vscode (afaik).
   2. Currently, one would have to press the delete key between every "join line" command. This nearly doubles the keystrokes required.