Commits on Mar 15, 2022

1. Context::request_repaint will wake up the UI thread …

   This adds a callback (set by `Context::set_request_repaint_callback`)
   which integration can use to wake up the UI thread.
   
   eframe (egui_web and egui_glow) will use this, replacing
   `epi::Frame::request_repaint`.
   
   Existing code calling `epi::Frame::request_repaint` should be changed
   to instead call `egui::Context::request_repaint`.
   
   This is the first callback added to the egui API, which otherwise is
   completely driven by data.
   
   The purpose of this is to remove the confusion between the two
   `request_repaint` methods (by removing one). Furthermore, it makes
   `epi::Frame` a lot simpler, allowing future simplifications to it
   (perhaps no longer having it be `Send+Sync+Clone`).

   

   emilk committed Mar 15, 2022
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