bug#47360: 27.1; using 'bar cursor, mouseclick is rounded to the wrong char position

[Julian Rohrhuber]

> On 24. Mar 2021, at 20:08, Julian Rohrhuber <rohrhuber@protonmail.com> wrote:
>
>> On 24. Mar 2021, at 19:39, Lars Ingebrigtsen <larsi@gnus.org> wrote:
>>
>>
>> Julian Rohrhuber <rohrhuber@protonmail.com> writes:
>>
>>> But when in bar mode, it should jump to the right when the click is
>>> right of the middle of the character, and only left when to its left
>>> of the middle.
>>>
>>> Instead, it also jumps to the left.
>>
>> The cursor shape is purely cosmetic at present, I think.  Your
>> suggestion to add semantics to the bar shape makes some intuitive sense,
>> but I'm afraid that might leave us open to user interface
>> inconsistencies unless considered carefully.
>
> yes, I definitely see your point here. The concept of a bar is indeed more 
> than cosmetic, even if perhaps the differences are easily taken into account.
>
> For those who use other editors are habituated very deeply to a specific 
> behaviour of the bar, and anything that deviates from this feels subtly but 
> clearly broken.
>
>
>> Are there other instances we might want to do something based on the
>> cursor shape other than setting point with the mouse, I wonder?  Would
>> "marking an area to the left" (i.e., clicking on a character and then
>> dragging to the left) be handled differently?  In that case, dragging
>> starting with the mouse at any point right of the bar cursor should
>> perhaps include the character under point, and not just at the half-way
>> point?
>
> I've checked with some editors, e.g atom (using huge font is easiest), the 
> selection works just like the jump (so it is a selection of zero length). 
> When you click to the right of the middle of a character and then drag to the 
> left, the character will be included. If you drag to the right it will not be 
> included.


There is one more case where one can feel the difference: when selecting with 
the mouse and dragging to the right, the selection jumps to each character a 
little "too late", that is, after you have already crossed the position you 
want the selection to end at. You have to point to a character *after* the one 
you want to include. The current selection always is up to one character behind 
the cursor barline.  This results in a "sticky" feeling.