If you file out the port field in the connect window and then you want to change it by selecting a cipher in the middle of the textbox and you press the back delete key, your cursor will be moved to the end of the port number.

For example if you want to change 27017 to 27027 if you click to position the cursor after the 1 digit and you press delete, then the cursor is moved to the end of the field value (in this example the last 7).

This is annoying and can lead to typing a bad port number.

Tested on OSX and Ubuntu.