Description:
In some circumstances, Impress duplicates "Ink-Notes" (using "mouse as pen" drawn while presenting) by a factor of 2 each time I start the presentation or add another mouse-as-pen drawing.

In short: when I start the presentation and draw a circle, then stop it, there's one red circle. Then I start and stop again (caveat: depends on the "version", see below), there's two circles (exactly overlain on each other). Start-Stop again makes it 4. Do that 10 times and we end up with >1000 copies already, making LO unresponsive.

Steps to Reproduce:
Depending on factors I have not yet understood (see https://bugs.documentfoundation.org/show_bug.cgi?id=112687#c20), the Ink is either stored as a single polyline (possibility #1) or as a set of individual lines and polygons (possibility #2, old behavior). This is something different of course, but I found it to be related.

Depending on how the "ink" is stored/represented, I found two ways of reproducing the behavior of duplicated "mouse-as-pen" drawings:
#1 (ink is a single polyline): start the presentation (no need to draw anything, but it's the same if you do) and stop again.
All _previous_ drawings (mouse-as-pen-made) are duplicated.

#2 (ink is a set of lines and polygons): start the presentation, but this time _you need to draw something_. Stop again: 
All _previous_ drawings (mouse-as-pen-made) are duplicated.

Actual Results:
My guess: all previous objects get duplicated once drawing has started. When that happens, somehow depends on the hardware !?

I currently don't have to many different LO versions at hand to test, but here's a few (testing results first, refs relate to versions in the "Other Information" section):

[1a]: follows #2 (individual lines), duplicates when drawing new lines
[1b]: different machine: follows #1 (one polyline), duplicates when starting the presentation
[1c]: Windows (VM), follows #1
[2]: follows #2
[3]: follows #1

So I don't see any pattern here with versions, rather than how the input might be processed:
[1b, 1c, 3]: Laptop with Touchscreen and Pen (though drawings done with a Mouse) and a VM (emulated USB Tablet)
[1a, 2]: Mouse only

Expected Results:
No duplication of drawings made using "mouse-as-pen" feature.


Reproducible: Always


User Profile Reset: Yes

Additional Info:
[1a]
Version: 25.2.3.2 (X86_64) / LibreOffice Community
Build ID: bbb074479178df812d175f709636b368952c2ce3
CPU threads: 12; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF-8); UI: de-DE
Flatpak
Calc: threaded

[1b]
Version: 25.2.3.2 (X86_64) / LibreOffice Community
Build ID: bbb074479178df812d175f709636b368952c2ce3
CPU threads: 8; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF-8); UI: de-DE
Flatpak
Calc: threaded

[1c] Version: 25.2.3.2 (X86_64) / LibreOffice Community
Build ID: bbb074479178df812d175f709636b368952c2ce3
CPU threads: 4; OS: Windows 11 X86_64 (10.0 build 26100); UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: de-DE
Calc: threaded

[2]
Version: 25.2.2.2 (X86_64) / LibreOffice Community
Build ID: 7370d4be9e3cf6031a51beef54ff3bda878e3fac
CPU threads: 12; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF-8); UI: de-DE
Calc: threaded

[3]
Version: 24.2.7.2 (X86_64) / LibreOffice Community
Build ID: 420(Build:2)
CPU threads: 8; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF-8); UI: de-DE
Ubuntu package version: 4:24.2.7-0ubuntu0.24.04.4
Calc: threaded