About redrawing while the SDL2 window is being resized

[tinchodias]

As you know, Bloc and Pharo IDE in a SDL2 OS Window can't redraw while a window is being resized by the user:

This is an old issue in SDL2 and I read news from 2024 with two possible solutions for us: one is only in the new SDL3, and the other a workaround in SDL2.

If we create (or upgrade) bindings to SDL3 (I checked the migration guide and it may require mostly renaming functions). This is the solution: https://wiki.libsdl.org/SDL3/README/main-functions#how-to-use-main-callbacks-in-sdl3.

The workaround in SDL2 uses SDL_WINDOWEVENT_EXPOSED and SDL_AddEventWatch: https://discourse.libsdl.org/t/window-event-at-initiation-of-window-resize/50963

I create this issue as a reminder to check the technical details (@tesonep ?)

[tinchodias]

Read also:

• https://www.reddit.com/r/sdl/comments/1cna5ir/a_couple_issues_with_sdl3_i_require_assistance/
• https://github.com/libsdl-org/SDL/blob/main/docs/README-migration.md