zathura crashes while zooming

### Is there an existing issue for this? - [x] I have searched the existing issues ### Problem When I zoom a large pdf document RAM consumption rises to available amount and then zathura is killed. By compiling different zathura versions I found that the bug appears starting with c2c754e4. Before it zathura uses less then 2GB of RAM. ### Steps to reproduce Open a large pdf document and try to zoom it. Specifically, I encountered the bug with the POSIX Issue 8 specification. ### Expected behavior Proper RAM consumption. ### zathura version (zathura --version) zathura 2026.03.27 ### girara version (zathura --version) girara 2026.02.04 (runtime: 2026.02.04) ### zathura backend appears with either mupdf or poppler