https://bugs.kde.org/show_bug.cgi?id=142728

Peter Ped Helcmanovsky <p...@7gods.org> changed:

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                 CC|                            |p...@7gods.org

--- Comment #4 from Peter Ped Helcmanovsky <p...@7gods.org> ---
(In reply to Justin Zobel from comment #3)
> As this report hasn't seen any changes in 5 years or more, we ask if you can
> please confirm that the issue still persists.

KCalc 21.08.1 (current KDE Neon user package at this time), the OP issue is
still present:

press: 5, 5, +/-,  get -55, another press +/- leads to 55
press: 5, +/-, 5,  get -55, another press +/- leads to 55
press: +/-, 5, 5,  get 55, another press +/- leads to -55 (topic of this
report)

Seems the "+/-" is already capable to operate on incomplete value and could
undo/redo the effect when pressed multiple times during entering value.

It works even with zero value with decimal dot (press: "dot", +/-, get "-0.").

So the only situation when it doesn't work is before any non-zero-digit or dot
is pressed. From UI and expression-Math point of view I can't right now figure
out any issue with enabling it, the only "catch" is to distinguish between +/-
pressed after or before value, i.e. 5, +/-, +, +/-, 5 should result in
expression "-5+-5", with the operation "+" creating boundary between
first/second value.

TLDR: still valid wish as far as I can tell.

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