GtkSourceView on GTK 4
I spent some time this cycle porting GtkSourceView to GTK 4. It was a good opportunity to help me catch up on how GTK 4’s internals have changed into something modern. It gave me a chance to fix a few pot-holes along the way too.
One of the pot-holes was one I left in GtkTextView years ago. When I plumbed the pixelcache into GTK 3’s TextView I had only cached the primary text content. It seemed fine at the time because the gutters (used for line numbers) is just not that many pixels. So if we have to re-generate that every frame, so be it.
However, in a HiDPI world and 4k monitors on our laps things start to get… warm. So while changing the drawing model in GtkTextView we decided to make the GtkTextView gutters real widgets. Doing so means that GtkSourceGutterRenderer will be real GtkWidget‘s going forward and can do all sorts of neat stuff widgets can do.
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