Re: display.texi: (<line>,<col>) isn't documented.

[Richard Stallman]

    Recently, David make a remark against turning on transient-mark-mode by
    default, saying that "unintended active regions" lead to "constant
    interference...with both buffer display and operation". I'm not sure what he
    had in mind, but perhaps an unexpected empty region is part of it.

    Better to not have to reflect and determine that "something seems broken".

Let's investigate this problem and look for the best solution.
First task is figure out what scenarios these problems happen in.