[konsole] [Bug 401094] Malayalam rendering regression in Konsole 18.08

[Mariusz Glebocki]

https://bugs.kde.org/show_bug.cgi?id=401094

--- Comment #17 from Mariusz Glebocki <mglb at arccos-1.net> ---
(In reply to Rajeesh K V from comment #16)
> In the attached screenshot, you can see that the bottom portion of a glyph
> with  vertical conjunct is cut-off, which is the only minor issue.

I think "Line spacing" feature should be modified to center text vertically and
then it could be used to solve such issues.

> I can provide test cases for this (the text and corresponding
> image of expected rendering). Is there a test case repository where I can
> contribute these?

`tests` directory here: https://invent.kde.org/kde/konsole

I was testing with this:
https://github.com/santhoshtr/malayalam-conjuncts/blob/master/conjuncts.txt

Since Konsole does not handle conjuncts rendering itself (it only groups
characters into strings and clips the result) I think most basic sample would
be enough, e.g. entry in tests/GLASS.utf8. Due to the fact that the rendering
result depends heavily on fontconfig configuration and installed fonts,
rendering verification is best done by displaying the same text in Konsole and
something known to render properly (GUI text editor, web browser).


BTW. I've pushed new commit which groups characters by scripts they belong to.
All unicode scripts are covered, not only Malayalam. Known bug: non-latin +
latin strings are not grouped (e.g. സ്കൂളിൽ.txt).

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