* Fix build with Clang 10
* System depend code deduplication
* Improve multi-layer style picker.
Allows clicking anywhere on a stroke in another layer to pick it -
not just the center.
Fixes#2843.
* Get actual pixel size instead of hard-coding to 1.0.
Co-authored-by: Rodney <rodney.baker@gmail.com>
Co-authored-by: Rozhuk Ivan <rozhuk.im@gmail.com>
Co-authored-by: Martin van Zijl <martin.vanzijl@gmail.com>
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