Visual Mode: fixed a bug where auto-aligning textures wouldn't work correctly in game configurations without support for local sidedef texture offsets, when short texture names were used, but the texture's source was a full texture name (i.e. from the /textures directory)

OBJ model loader: fixed sanity checks for faces that reference non-existing vertices, texture coordinates, or normals

MODELDEF: Fixed a crash when a FrameIndex tried to reference a model index that wasn't defined. Fixes #578

Fixed a crash when undoing after using the "test from current position" action when no player 1 start is in the map. Fixes #573

Stair Sector Builder Mode: fixed a crash when trying to build geometry from linedefs without sidedefs. Fixes #569

Linedefs Mode: fixed a problem where flipping a highlighted linedef would also select the linedef. Fixes #571

Map options: removed checkbox for opening resources as read-only. Resources are now always opened as read-only. Fixes #559

Open WAD dialog: don't filter for lowercase *.wad exclusively on non-Windows platforms. Resolves #567

Game configuration dialog: don't filter for only .exe and .bat when selecting a test program on non-Windows platforms. Resolves #566

Negative vertical patch offsets are now handled correctly based on the game configuration. Fixes #561

TEXTURES lump: fixed a problem where textures that use textures as patches were too bright when gamma correction was enabled

Fixed a problem where linedefs were not split correctly under certain conditions when drawing or moving lines

Fixed a problem where sprites with 16 rotations defined in the TEXTURES lump would not be handled correctly (they are still not displayed with 16 rotations, but don't throw an error anymore)

Don't use thread unsafe collections in threaded code (hopefully fixes crash in Sectors Mode when selecting sectors)

3D Floor Mode: only 3D floors with the "user_managed_3d_floor" field set to true will be modified in UDMF maps

Resetting a slope in Sector Edit Form UDMF or with the Reset Slope action will not set the height to the z position at the center of the sector anymore, but to its original height

Increased performance on multi-core CPUs when selecting sectors in Sectors Mode when Synchronize Thing Editing is enabled

Added some sanity checks for maximum number of entries in the VERTEXES/SIDEDEFS/LINEDEFS/THINGS lumps for the binary map formats

Fixed a problem where saving a map would hang when the nodesbuilder produced too much output on stdout and strerr. Fixes #417. Fixes #498

Added fixes for the stuck thing checker for the Eternity Engine configuration (thanks for hawkwind3). Fixes #551

Map Analysis Mode: fixed a problem where checking for stuck things works incorrectly in some situations (thanks to hawkwind3). Fixes #469