This patch changes the selection logic for footprints to fix a
reported issue[1] and to make the behavior more logical to me.
I know that correct selection behavior is something of a personal
preference, so I'm ready to be flamed :-)
The new behavior:
A footprint may be selected if:
1) The corresponding "Footprints" switch is on in the Items tab, AND
2) One or more of the layers that the footprint draws on is visible
This means that if all of the layers are turned off, footprints are
not selectable (fixes the bug), but it also means that now footprints
can be selected if any draw layers are visible (for example, if you
have only F.Mask enabled, you can select a footprint that has solder
mask and is on the front layer).
Before anyone complains, this is only if high-contrast mode is turned
OFF. When it is on, you can still only select items that *only* exist
on that layer (to make moving silkscreen around easier, for example)
Even though this adds some more for-loops to selection filtering, I
have not noticed any performance hits on some selection of large
boards that I tested. More testing is welcome.
[1] https://bugs.launchpad.net/kicad/+bug/1751960
-Jon
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