Added autosaving of the current map. Autosaving happens in intervals when the map is changed. It will not overwrite the current map, but rather create new files, just like backups. Autosaving interval and number of files can be configured in the "Recovery" tab of the preferences. Autosaving can also be disabled there (not recommended). Autosaves will not have their nodes built for performance reason.

3D Floor Mode: fixed a problem where the previous state of linedef arguments were not preserved for undo snapshots. Fixes #967

Script Editor: fixed a crash when the find/replace dialog was opened and the previously selected script tabs do not exist anymore. Fixes #993

Sound Propagation Mode: fixed a problem where removed sector geometry was still shown when undoing/redoing. Fixes #992

Fixed a problem where portal render style could not be set for the Eternity Engine game configuration

Visual Mode: fixed a problem where texture skewing didn't work correctly for textures scaled through sidedef properties. Fixes #985

Script Editor: pressing enter in the search box now performs the search. Pressing enter in the search box of the replace tab performs a search. Pressing enter in the replace box of the replace tab now performs a replacement. Pressing the Escape key now closes the dialog. Fixes #972

Visual Mode: added support for GZDoom style texture skewing

Sound Propagation Mode: fixed a crash when things were outside the map's geometry bounding box. Fixes #975

Edit Linedef dialog (UDMF): fixed a problem where the back sidedef's controls were not disabled correctly if their UDMF fields were not set in the game configuration

Added ability to enable/disable controls in the UDMF map element editing dialogs based on UDMF fields specified in the game configurations (#953)

Visual Mode: the effect of slope things are now only applied if they are specified in the game configuration

Game Configurations: added support for enabling or disabling support for vertex heights in UDMF game configurations

Visual Mode: fixed a problem where flood selection did not work correctly when sidedefs were previously marked by other actions

UDMF type handler: fixed a problem where default values provided as integers for floating point fields failed to convert properly

Visual Mode: fixed a problem where flood selection would operate from all selected surfaces and not just the clicked on one. This behavior can be reverted by enabling the "Use buggy flood select in Visual Mode" option in Preferences -> Editing (#969)

Visual Mode: fixed a problem where flood selection would operate from all selected surfaces and not just the clicked on one. This behavior can be reverted by enabling the "Use buggy flood select in Visual Mode" option in Preferences -> Editing

Text file parser: fixed a problem where parsing could fail if the file ended with a comment without an trailing newline

Game Configurations: fixed a crash when no default values for UDMF integer or  floating point fields are set

Game Configurations: UDMF integer and floating point fields can now have default values other than 0

OBJ Exporter: fixed a problem where the wrong textures were used on 3D floors when they have the "use upper/lower texture" flag set

Game configurations: renamed lightmap things from static to lightmap. Added pulsing, flickering, and random flickering lightmap things

Visual Mode: fixed a problem where floors/ceilings could not be changed in size if the user tried to change their texture offset in a non-UDMF map

Game Configurations: fixed a problem where the enum list of enum bits handlers was not set for UDMF fields

Visual Mode: fixed a problem where sloped 3D floors with an alpha value of less than 128 were not shown at all instead of fully opaque. Fixes #954

Draw Curve Mode, Draw Ellipse Mode, Draw Rectangle Mode: added option to place things at the designated vertex positions instead of drawing geometry (#956)

Point Thing at Cursor: check for a thing's fixedrotation rather than its category's arrow setting (#957)

Visual Mode: when applying camera rotation and pitch to things a status message will now be displayed. Fixes #955

Visual Mode: fixed an issue where trying to apply a rotation to things that were not seen yet would cause a crash