Support "masonry" layouts
"Masonry" layouts can be a nice way to display large numbers of unevenly sized rectangles in a visually appealing way. The way they usually work is that width is normalized across items (so there are e.g. 4 columns across the width of the view), and items are stacked above each other. The crucial part is that the content is sorted horizontally across columns (similar to a grid view) rather than vertically along the columns.
Example:
We would like such a layout in Lettercase, but as far as I understood it's not currently possible with GTK. Perhaps this could be considered as part of the new recyclable list/grid views?
This library implements the behavior for websites: https://masonry.desandro.com