Linedefs Mode, Sectors Mode, Vertices Mode, Sound Environment Mode, Sound Propagation Mode: slightly improved performance when moving the mouse

Visual Mode: fixed a problem where wide classic skies were not rendered with the correct orientation

Thing/Linedef/Sector editing dialog: fixed a crash when pressing the up key in the action input box when the last action is selected. Fixes #493.

Configuration file parser: floating point numbers without the "f" suffix are now parsed as double precision floating point numbers

ACS parser: fixed a bug that prevented scripts from being recognized when the previous line ended with an empty line comment

Texture browser: filtering for a texture name now automatically selects the best matching texture name. Addresses #483.

Visual Mode: fixed a bug where selected 3D floor tops/bottoms would appear to be selected after undo, but actually weren't selected anymore

Visual Mode: fixed a bug where the line slope things (9500 and 9501) would slope the same sector multiple times when multiple lines of the same sector were tagged to the thing. Fixes #491.

Copy/Past thing properties: fixed a crash when pasting properties from a thing that has no model assigned to a thing that has a model applied

Added preliminary DECALDEFS support. Parsing works, indexed decals and decal groups can be selected as the first argument of the Decal thing. Decals are not displayed in Visual Mode, decals without an index are not supported

Fixed a bug where PNG sprites without an offset incorrectly had their offset centered instead of using (0, 0)

When loading UDMF maps and fields that have NaN (not a number) as a value are encountered those fields will now be dropped permanently. A warning that this happens will be displayed in the Errors and Warnings dialog.

Editing modes: fixed some crashes related to undoing/redoing while objects with associations were highlighted

Hexen game configuration: corrected an error where things 78 ("Tall Tree 1") and 79 ("Tall Tree 2") had their sprites interchanged

Find the exact Scintilla.NET API used by UDB and create a stub implementation so that it builds without

Visual Mode: changed "Apply Camera Rotation To Things" action to apply more sensible rotation values to things