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[flint] Sync image widget rendering with the user redraw rate

Valentin Valls requested to merge valentin.valls/bliss:reduce-image-widget-rendering into master

This MR fixes extra events received in the GUI side of Flint.

Events was informing change of the image/MCA and the redraw was bypassing the requested user redraw rate. Basically the exact same image was redrawn many time.

The problem is fixed by merging together duplicated events.

This should fix part of hi-CPU load on hi-speed scans (not the memory consumption AFAICS, or only part of it). But it already can be useful.

Edited by Valentin Valls

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