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Alexander Larsson authored
At the end of GtkImage css validation (during style-updated) when the css properties (like the icon size) are valid we call _gtk_icon_helper_preload which does an async icon theme lookup and load. This will happen on a thread in parallel with the rest of the css machinery, and hopefully by the time we need the icon it will be ready. If not we will block when we need it, but during that blocking all the other icons will be loaded. Testing widget-factory this changes the time of snapshot() from 31 to 25 msec, but on the other hand we also load a few more icons that we didn't before causing the css validation phase to be about 8 msec slower. This is because we're preloading all the images in the window, not only the ones that are visible. Unfortunately we still load a bunch of icons in snapshot(), from GtkCssImageIconTheme, and ideally we should try to preload those also.
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