[Libreoffice-bugs] [Bug 136974] New: Enhancement request: MATH, adding up/down double arrows and reversible chemistry arrows

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=136974

            Bug ID: 136974
           Summary: Enhancement request: MATH, adding up/down double
                    arrows and reversible chemistry arrows
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: Formula Editor
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: lajo at rn.dk

Description:
The math / formula editor currently allows a range of arrows, including double
arrows point right (drarrow), left (dlarrow), or left-and-right (dlrarrow). 

However, no such arrows pointing up and/or down are defined in the manual (Math
Guide  version 6.4). These arrows are quite standard in mathematics, so they
would be natural to include.

Also missing: An arrow for reversible chemical reactions, i.e. two arrows above
each other, the upper pointing left, the lower pointing right. This has been
asked for in at least two questions on the forum:
https://ask.libreoffice.org/en/question/60428/formula-double-arrows-for-chemical-equations/
https://ask.libreoffice.org/en/question/160395/double-harpoon-arrow-for-type-chemistry/
Even though the answers to the questions indicate workarounds, it is a standard
chemical symbol that (IMHO) would be a natural addition to the equation editor
- as well as the symbols menu.

Steps to Reproduce:
1. Open formula editor
2. Look through subgroups to find these symbols

Actual Results:
In subgroup "Relations", the left/right double arrows are defined, but not
up/down. Through the Functions > Symbols > Edit menu, double up (Ux21D1) and
double down (Ux21D3) can be found, but not the combination up&down. The
chemical reversible arrow set cannot be found. 

Expected Results:
These symbols should be part of the implemented symbols. Suggested naming:

duarrow: double up-arrow (corresponding to Ux21D1)
ddarrow: double down-arrow (corresponding to Ux21D3)
dudarrow: double up-and-down arrow
loverrarrow: chemical left-over-right arrow for reversible reactions


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.0.1.2 (x64)
Build ID: 7cbcfc562f6eb6708b5ff7d7397325de9e764452
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: Skia/Vulkan; VCL: win
Locale: da-DK (da_DK); UI: da-DK
Calc: threaded

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