[Libreoffice-bugs] [Bug 125363] New: UI: LibreOffice Calc's AutoFilter treats combining and modifier letters the same as plain letters in the value list

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=125363

            Bug ID: 125363
           Summary: UI: LibreOffice Calc's AutoFilter treats combining and
                    modifier letters the same as plain letters in the
                    value list
           Product: LibreOffice
           Version: 6.0.7.3 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: carbeck+bugzilla at gmail.com

Description:
LibreOffice Calc's 'AutoFilter' popup menu treats combining diacritic letters
(like U+0364, U+0366) and modifier letters (like U+1D49) as identical to their
plain equivalents in the value list. For instance, in a column that contains
both 'tuon' and 'tuͦn' (variant spellings of Middle High German for 'to do'),
only one variant will be listed (see screenshot). As expected, filtering for
the listed variant indeed only lists those cells in which that variant appears
verbatim, but not the other variant.

Steps to Reproduce:
1. Create a list of words in a column containing words with a plain, regular
letter and the corresponding combining diacritic letter or modifier letter in
its place (e.g. tuon, tuͦn; guet, guͤt; vröude, vröudͤ), make the first cell in
the column some field identifier like 'mylist', 'example', or '123'.
2. Data > AutoFilter
3. OK, use first line as header
4. Click the dropdown arrow in the header of the column that contains our word
list

Actual Results:
Only one variant of the word is listed in the value list: either with the plain
letter (tuon, guet, vröude) or the combining/modifier letter (tuͦn, guͤt, vröudͤ).

Expected Results:
Both variants are listed—AutoFilter doesn't treat superscript/modifier letters
the same as their plain equivalents, i.e. all of tuon, tuͦn, guet, guͤt, vröude,
vröudͤ are listed as values occuring in the selected column.


Reproducible: Always


User Profile Reset: No



Additional Info:
Screenshot: https://i.imgur.com/DTZhV6e.png
Version: 6.0.7.3
Build-ID: 1:6.0.7-0ubuntu0.18.04.5
CPU-Threads: 4; OS: Linux 4.15; UI-Render: Standard; VCL: kde4; 
Localization schema: de-DE (de_DE.UTF-8); Calc: group

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