[Libreoffice-ux-advise] [Bug 155893] Table cell baseline misalignment when using different fonts

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=155893

--- Comment #8 from Eyal Rozenberg <eyalroz1 at gmx.com> ---
(In reply to ⁨خالد حسني⁩ from comment #7)
> It depends on what the expectation is. It seems the current behavior aligns
> the ascenders and descenders not the base lines.

I guessing you mean either ascenders or descenders?

> It probably makes sense,
> for top alignment you need to aligns the top of the lines so that is the
> ascender, for bottom alignment it is descender and for middles align it is
> line height (ascender + descender).

I'm not sure that aligning ascenders or descenders makes sense.  Suppose we
have two fonts F1 and F2 which are identical, except that F1 has really long
ascenders - just extended upwards for l, and b, and d etc. We now write:

 -------------
| abcd | abcd |
 -------------

with the left cell being set in F1 and the right in F2; so I'll replace d with
an l-over-a-d . Now, let's  what would the user expect?

 -------------
|    l |      | 
| abcd | abcd |
 -------------

 -------------
|    l | abcd | 
| abcd |      |
 -------------

I claim that even with _top_ alignment - the user would expect the first
option. Why? Because the _mean_lines_ [1] are aligned - the top of the main
part of the glyphs. Ascenders are extra; somewhat ornamental. It's the "meat"
of the text that needs to be aligned.

So, I guess after would expect that:

top    v-alignment -> alignment of meanlines
bottom v-alignment -> alignment of baselines
middle v-alignment -> alignment of middle-point between baseline and meanline


What is the basis, in principle or historically, to act otherwise?


> If one sets highlight color, it will be
> clear that the line boxes are aligned.

Well, they are, but that's like saying the table cells are aligned. Alignment
of cells and boxes doesn't matter much if it does translate into alignment of
the text within those boxes.


 [1] : https://en.wikipedia.org/wiki/Mean_line

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