Is there a pastebin service that supports terminal escape sequences

The "non-printing escape sequence" is needed when using non-printing characters in $PS1 because bash needs to know the position of the cursor so that the screen can be updated correctly when you edit the command line. Bash does that by counting the number of characters in the $PS1 prompt and then that's the column number the cursor is in.

However, if you place non-printing sequences in $PS1, then that count is wrong and the line can be messed up if you edit the command line. Hence the introduction of the \[ and \] markers to indicate that the enclosed bytes should not be counted.

Konsole ignores that, because it relies upon a hard-coded list of keys which cannot be mapped:

// Override any of the following shortcuts because
// they are needed by the terminal
int keyCode = keyEvent->key() | modifiers;
switch (keyCode) {
    // list is taken from the QLineEdit::event() code
case Qt::Key_Tab:
case Qt::Key_Delete:
case Qt::Key_Home:
case Qt::Key_End:
case Qt::Key_Backspace:
case Qt::Key_Left:
case Qt::Key_Right:
case Qt::Key_Slash:
case Qt::Key_Period:
case Qt::Key_Space:
    keyEvent->accept();
    return true;
}
return false;