Let's handle the open PRs!

[Jonarw]

First of all, I want to apologize for being rather absent from this project lately. I struggle to find much time to dedicate currently, and when I do find some time, I tend to not quite know where to start, as there are currently 19 open PRs, some of which are several years old.

As a personal goal, I would like to be more active in at least handling PRs in a timely manner in order not to discourage any potential future contributions. As a first step I would propose that we try and handle the PRs that are currently open as far as possible. My hope is that I will be able to involve myself more consistently in the future once the pile of unhandled PRs does not seem so high anymore - feel free to remind me of that ;)

Below are some of my thoughts on how we could proceed with the open PRs, but those are just proposals for now to jump-start the discussion. After not being very active for some time, I wouldn't want to barge in and merge a bunch of stuff.
In general, I think PRs should only be open if there is a clear path for them to be closed eventually. Below I made a list of all currently open PRs with proposals on how to proceed on each of them.

PR	Proposed Action
PREVIEW: Crossplatform tooltip system	No activity for 3.5 years, close it
Reduce dependence on default axes in ExampleLibrary (#1547)	I do not see us removing support for default Axes in the near future, so maybe we could close this for now?
Overhaul Text Arrangement and Trimming	No activity for quite some time, but it would be cool to get this merged eventually! Do you have plans to continue on this at some point @VisualMelon? If you think there might be a vague chance, let's leave it open
Add supports HiDPI for winforms examples	No activity in 2,5 years. If I understand the comments from back then correctly, this just affects the Example Browser and does nothing to actually improve rendering for Hi DPI in the WinForms renderer. Maybe ping the original author if there is interest to continue, and if not close it?
Allows one-cell grid.	Not quite sure anymore about what this was about, I think we could close this
VectorSeries	Would be nice to merge that eventually! Let's leave it open for now
Links to issues in CHANGELOG.md	Would need to update it, but other that that I think we could merge it
So far only LabelFormatString moved to the base class, I would provide GetFormattedLabel method as a separate commit	The intent is not immediately obvious to me, no activity in 1.5 years, I would say close it for now
Add PathAnnotation.TextBackground properties (#1900)	Seems there is some naming to be sorted out, let's discuss in the PR and get it merged
Tidy up, modernise code and VS cleanup	In principle I like the idea of this PR and some code clean-up in general. However I think ideally we would want to do that when we don't have a lot of other open PRs, as this will create a lot of merge conflicts. So I would propose to close this for now and revisit after we hopefully manage to reduce the number of open PRs :)
DataPointSeries.GetItem is using cached items source points.	Seems there are some issues remaining. Maybe ping the original author if there is interest to continue, and if not close it?
Improve Project Files	There seem to be some conflicts, but seems not too difficult to sort out. Leave it open for now and see if we can get it merged eventually?
Add AxisArea, AxisLineArea and AxisTitleArea property in Axis class	Seems ready to merge
Add BarSeries.LabelAngle property (#1870)	Merge
Fix HitTest when IsLegendVisible is false (#1975)	Merge
Add example and fix for incorrect final tick on category axis (#1971)	Merge
Make consistent BaseValue and BaseLine across BarSeries, LinearBarSeries, and HistogramSeries	Merge
Fix incorrect coloring of TwoColorLineSeries	Merge
Add CodeQL workflow	Seems sensible

Of course this is mainly adressed to @oxyplot/admins, but anybody is welcome to chime in.

Once we have settled on what to do, I will be happy to perform the necessary actions.

[VisualMelon]

@Jonarw thanks for raising this. On my side, definitely up for a clean-up. I'm reasonably busy at the moment, but will try at least to be active in any discussion to keep things moving. Quick probably-not-comprehensive comments:

• I'm happy for those you've marked 'Merge' to be merged if you're happy with them
• Add CodeQL workflow #2009 has a +1 from @objorke so if you're happy let's get that in as well.
• I'm happy for Add AxisArea, AxisLineArea and AxisTitleArea property in Axis class (… #1966 to go in if someone else has checked over the APIs (some discussion of the naming in there)
• I'll try to take another look at VectorSeries #1672 soon, and if we're all OK with the current API I'm probably happy for it to be merged
• Happy to close or merge Reduce dependence on default axes in ExampleLibrary (#1547) #1550 depending on how everyone else feels: not hard to put it together again if we change our mind later.
• For Tidy up, modernise code and VS cleanup #1920 and Improve Project Files #1937, best to focus on the latter first, and see if @BobLd can send us his config for the former, then we can as you say put a clean up through when there are fewer open PRs
• I'm certainly happy to keep working on Overhaul Text Arrangement and Trimming #1556 - it will be good to look back at it with fresh eyes to check that the design makes sense. Hopefully then we can think about how we can put it to work for issues like Set max width for axis values  #2008
• Agree Add PathAnnotation.TextBackground properties (#1900) #1913 needs a proper API review: input welcome and obviously not a big task to implement any suggestions
• Agree on Ping+Close for inactive: no reason they can't be reopened later
• I'm not convinced by Links to issues in CHANGELOG.md #1815, but if everyone else approves then happy for it to be updated and merged

[VisualMelon]

@Jonarw quick update from my side

• Left a comment on Add PathAnnotation.TextBackground properties (#1900) #1913 ; should be able to merge that soon
• Will probably be a week or so before I get around to looking at Overhaul Text Arrangement and Trimming #1556 and VectorSeries #1672 properly again
• Equally will be a bit of time before I can look at Add supports HiDPI for winforms examples #1597 properly, but I'm happy for it to be merged in its current state if we want to get on with it

[objorke]

Thanks @Jonarw for following up the open PRs!