Some background first.
If you're running a GUI Vim, 'ballooneval' is true and 'balloonexpr'
is set to an expression, whenever the mouse rests for a short while
pointing to a non-blank character the said expression is evaluated
and the result is shown in a "balloon". A number of v: variables are
available for use in the expression, such as the coordinates the mouse
is pointing to.
The expression is supposed to return either a string, or a list of
strings. There's a bit of fun related to what happens if the underlying
OS can't handle multiline balloons, but let's assume the OS can actually
deal with them.
Now the problem.
According to the manual:
: When they are supported "\n" characters will start a new line. If the
: expression evaluates to a |List| this is equal to using each List item
: as a string and putting "\n" in between them.
The problem is a trailing "\n" is always added when the expression
evaluates to a list, and this is pretty much never what you want.
Namely, compare the effect of:
set beval bexpr=['foo']
to the effect of:
set beval bexpr='foo'
This happens because general_beval_cb() in gui_beval.c calls
eval_to_string() to evaluate 'balloonexpr', and that function adds the
trailing "\n". I don't see any non-intrusive fix to this.
/lcd
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