* Improved error message when adding external tileset
* Tile Collision Editor: Fixed invisible tile for isometric
oriented tileset (#2892)
* Fixed Object Alignment not getting set when reloading a tileset
* Ignore attempts to replace a tileset with itself
* qmake: Support linking to system Zstd on all UNIX-like systems
OBS-URL: https://build.opensuse.org/package/show/games:tools/tiled?expand=0&rev=58