Misspelling of recipient´s email address cannot be corrected without deleting the whole address

[mbohlender]

Steps to get to the problem: Write email --> add recipient´s email address ; if recipient´s address has a mistake one can only delete the whole address but not correct it

Suggestion: It would be helpful if one could move the curser to any character/sign of recipient´s email address. Double click on the address would be a reasonable way to activate the editing process.

[alecpl]

Implemented editing on double click.