[plasmashell] [Bug 470096] New: Line.svg drawn inconsistently in Networks compared to Kickoff

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https://bugs.kde.org/show_bug.cgi?id=470096

            Bug ID: 470096
           Summary: Line.svg drawn inconsistently in Networks compared to
                    Kickoff
    Classification: Plasma
           Product: plasmashell
           Version: 5.27.4
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: plasma-b...@kde.org
          Reporter: doncb...@gmail.com
                CC: k...@davidedmundson.co.uk
  Target Milestone: 1.0

SUMMARY
While making a plasma style, I noticed that line.svg (the horizontal asset) is
drawn in at least 3 different ways. I'm actually confused as to what the code
is, because how it responds seems arbitrary. The 3 use locations in question
are a) where plasmoids meet their panel, b) the separator in the left pane of
Kickoff, c) the separator in system tray's Networks section when a connection
is expanded to show speed/details.

(For checking this behavior, you will have to restart plasmashell, as it
usually doesn't update the line sizes)

My line has invisible margin added, so it is thicker than 1px even though it
looks to be 1px thick. In the case of c), if the asset is 1px, the line will be
1px thick, but if it is greater, it well be stretched to 16px thick, regardless
of its size. b) was the "traditional" way of doing it, where it would (after
restarting plasma) set its thickness to that of the svg asset rather than
stretching it to some value.

STEPS TO REPRODUCE
1. Choose a plasma theme whose horizontal separator is greater than 1px thick
(e.g. Colloid Light)
2. Apply/restart plasma
3. Open Networks and select the dropdown on a connection
4. Open Kickoff and observe the separator on the left

OBSERVED RESULT
Although Kickoff shows a 1px separator, Networks stretches it to 16px and
produces an unusually thick separator.

EXPECTED RESULT
The thickness is either preserved according to the svg, or always set to a
specific value (e.g. 16px).

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.8
Kernel Version: 5.19.0-38-generic (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION
a) always sets the line to 1px thick because the line is assumed to be 1px.
While I believe that Content separators and the line that separates plasmoids
from the panel are functionally different and should not use the same asset,
it's a bit tedious and would add more complexity to theme making just for a
line. The vertical separator lines and notifications have a similar issue.

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