Fixed, Visual mode: double-sided middle texture highlighting transparency check didn't take TEXTURES scaling into account.
Fixed, long texture names: textures located in a directory/pk3/pk7 root can't have long texture names.
Fixed, texture selector controls, long texture names: both long and short texture names should be added to texture name auto-completion list. 
Changed: "Grid Increase" and "Grid Decrease" actions can now be bound to mouse wheel.

Fixed, DB2 bug: side panel's tabs were drawn incorrectly when panel's height was lower than cumulative tabs height.
Visual mode, GLOOME: wall/floor/ceiling sprites are now rendered closer to the way it's done in GLOOME.
Sectors mode, UDMF: some cosmetic tweaks to comment icons rendering.
Classic modes: linedef rendering is now skipped when it's visible length is very short.
General interface: fixed a possible crash when clicking on the warnings count label when it was updated from the background thread.

Fixed, Visual mode: texture coordinate generated to test if double-sided middle texture is transparent was shifted 1 pixel up.
Fixed, Visual mode: offsets of GLDEFS lights were not affected by thing's angle.
Updated SharpCompress (0.10.3 -> 0.11.1).
Updated ZDoom_DECORATE.cfg.

Changed, Visual mode: changed thing fog calculation logic. Should be closer to GZDoom now.
Fixed, GLDEFS parser: "height" texture parameter was not treated as optional.
Fixed, text lump parsers: in some cases incorrect line number was displayed in error and warning messages.
Fixed, Visual mode: glow effect was not applied to sectors with 3 sidedefs.
Fixed, Visual mode: in some cases glow effect was not updated when replacing textures. 
Fixed, general interface: "Full Brightness" button state was not updated during map loading.
Fixed, Drag Linedefs/Vertices/Sectors/Things modes: positions of line length labels were not updated while panning the view.
Cosmetic: added a bunch of new icons.
Cosmetic: changed Visual mode crosshair.

Changed, Drag Linedefs/Vertices/Sectors/Things modes: line length labels are now displayed the same way as in Draw modes.
Changed, Drag Linedefs/Vertices/Sectors/Things modes: "lock movement to cardinal directions" mode (Alt-Shift-Drag) now locks movement in 4 directions instead of 8 and doesn't snap map elements to nearest grid intersections when they are not aligned to it. 
Added, Visual mode, GZDoom, DECORATE: FORCEXYBILLBOARD flag is now supported.
Added, Visual mode, GLOOME, DECORATE: FLOORSPRITE, CEILSPRITE, WALLSPRITE, ROLLSPRITE and STICKTOPLANE flags are now supported (implementation is somewhat broken ATM and probably doesn't work the same way as in GLOOME, because Windows build with most these features is nowhere to be found...).
Fixed, Visual mode: in some cases Thing brightness was calculated incorrectly.
Updated ZDoom_DECORATE.cfg.

UDMF: most of the code now supports multiple sector/linedef tags ('moreids' UDMF property). The only things left out are Tag Explorer and Tag Range plugins.

Fixed, Classic modes, Visual mode, UDMF: the last argument of Sector_Set3dFloor (160) action must be ignored in UDMF.

General interface: selection info is now always displayed.
Visual mode: you can now hold Alt-Shift or Ctrl-Alt while selecting sidedefs to stop selecting connected sidedefs when already (un)selected sidedef is encountered.
Added, Numeric Textbox: you can now use "+++" and "---" prefixes to incrementally increase or decrease result values by given value.
Fixed, Numeric Textbox: fixed a potential divide by zero exception when using "/" prefix in numeric textboxes with decimal input enabled.
Fixed, Thing Info panel: relative z position of things with "+SPAWNCEILING" flag was incorrect.
Changed: Update checker now displays messages using MessageBoxes when called manually.
Map Analysis: changed result descriptions for Unknown Texture and Missing Texture checks.
Doom map format: renamed "Secret" linedef flag to "Shown as 1-sided on automap".
Updated ZDoom_DECORATE.cfg (A_RadiusGive stuff).

Added some boilerplate to CommentsDocker.
Internal: converted a bunch of if-elses to switches.

Fixed, Visual mode, "Auto-align textures" actions: auto alignment was applied incorrectly to middle parts of doublesided lines.
Fixed, Visual mode, "Auto-align textures" actions: in some cases generated texture offsets were not rounded to map format decimal number precision.

Fixed, Visual mode, since r2336: in some cases local vertical texture offset was calculated incorrectly when checking sidedef's texture alpha.

Fixed, Visual mode, UDMF: in some cases texture offsets were changed incorrectly while dragging sidedefs with negative texture scale.

Changed, Linedef Edit window, Visual mode, UDMF: when "Edit windows remember selected tabs" setting is enabled and Front or Back tab was previously selected, the tab, which corresponds to the highlighted side will be selected.

Fixed, Visual mode: z position of info lines for polyobject setup things was calculated incorrectly.
Updated ZDoom_DECORATE.cfg.

DECORATE: added "//$ArgNDefault" special comment. It can be used to specify the default argument value.
Visual mode, 3d floors: sloped 3d floors are now always rendered as opaque (just like in GZDoom).
Fixed a crash when creating a new unknown thing (introduced in r2324).
Documentation: updated "Action Argument Settings" and "DECORATE keys" pages.

Game Configurations: added "Thing Radius" (23) and "Thing Height" (24) action argument types. When non-zero, arguments of these types will affect the size of associated thing in Classic and Visual modes.
Game Configurations: updated things in ZDoom "Bridges" category to use argument types 23 and 24.
Documentation: added "Action Argument Settings" page, updated "Basic Settings", "Map Format Settings", "Linedefs Settings" and "Things Settings" pages in Configurations -> Game Configurations group.
Documentation: updated "DECORATE keys" page.

Fixed(?), PK3: SharpCompress doesn't like it when several threads try to read PK3 archive entries at the same time.
Fixed, Visual mode, 3d floors: floor and ceiling alpha calculation was broken.

Updated ZDoom_ACS.cfg and ZDoom_DECORATE.cfg.

Changed, Visual mode, Auto-align textures actions, UDMF: aligned texture coordinates are no longer rounded to integer values.
Changed, Things, Sectors, Linedefs, Vertices modes: we shouldn't select highlighted map element during the copy action when no map elements are selected.
Internal: removed some debug stuff from CheckTextureAlignment and ResultTexturesMisaligned.

Changed, Thing Edit Form: floor slopes are now taken into account when changing thing's absolute Z position (currently, only slopes, created using sector planes, vertex height offsets and "Plane_Align" (181) action are supported).
Changed, Thing Info panel: floor slopes are now taken into account when showing thing's Z position (same plane type limitations as above).
Changed, Thing Info panel: thing position is now shown as "X, Y, Z (abs. Z)".

Added GZDoom's glowing flats (http://www.zdoom.org/wiki/GLDEFS#Glowing_flats) support to Classic and Visual modes.
MAPINFO: added "DoomEdNum" and "SpawnNums" blocks support.
MAPINFO: added "#include" directive support.
MAPINFO: added "$gzdb_skip" special comment support.
DECORATE: "spawnthing" Game Configuration block is now updated using "SpawnID" actor property.
Game configurations: added "class" property to the most of ZDoom things.
Actions: removed "Reload MAPINFO" action.
Documentation: merged "GLDEFS and MODELDEF support", "(Z)MAPINFO support" and "TEXTURES support" topics into "(G)ZDoom text lumps support", added info about the other text lumps GZDB can use.

Visual mode: added support for "Transfer Floor Brightness" (210) effect.
Visual mode: added support for "Transfer Ceiling Brightness" (211) effect.
Visual mode: changed the way thing brightness is calculated. Should be closer to GZDoom now.
Sector Edit Form: you can now enter "++" or "--" into "Height Offset" input to raise or lower sectors by their height.
Cosmetic fix in ZDoom_linedefs.cfg.

Added, Visual mode, UDMF: added "Change Pitch Clockwise", "Change Pitch Counterclockwise", "Change Roll Clockwise" and "Change Roll Counterclockwise" actions.
Added, Visual mode, UDMF: added "Increase Scale" and "Decrease Scale" actions.
Added, Visual mode, UDMF: "Reset Texture Offsets" action now resets scale when used on things.
Added, Visual mode, UDMF: "Reset Local Texture Offsets" action now resets scale, pitch and roll when used on things.
Changed, Visual mode, UDMF: "Reset Texture Offsets" action now only resets texture offsets (previously it also reset texture scale).
Changed, Visual mode, UDMF: "Reset Local Texture Offsets" action now resets texture offsets, scale and brightness of sidedefs and also rotation of floors/ceilings.
Changed, Visual mode, UDMF: thing box arrow now displays pitch and roll for things, which have attached model and appropriate MODELDEF flags.
Changed, Thing Edit Form, UDMF: negative pitch and roll can now be entered.
Updated documentation.

Fixed, Models, Classic and Visual mode: MODELDEF scale and rotation transforms were applied in incorrect order.
Changed, Visual mode: things with "NOINTERACTION" DECORATE flag can now be rendered above ceiling / below floor.

Fixed(?), Texture Browser: possibly fixed Texture Browser not showing up / locking edit forms when current map has a ton of textures (like 2000 or more) in a single texture group.
Changed, cosmetic, Sector Info panel, Visual mode: info about currently highlighted surface is now shown using different color.
Changed, cosmetic, Linedef Info panel, Visual mode, non-UDMF: texture offset labels for currently highlighted sidedef are now shown using different color.
Changed, cosmetic, Vertex Info panel, UDMF: floor and ceiling offset labels are now grayed out when they have default values.

Added, Game configurations: added "thingclasshelp" property. It's used to open a website when thing class name is clicked in the Thing Edit form.
Changed, "Raise/Lower sector to nearest" action: 3d floors are now taken into account when using the action on things.
Updated documentation.

Added, Fit Textures action: the action now takes 3d floor's control side texture offsets into account when used on 3d floor sides.
Updated ZDoom ACC.

Fixed, Dockers Control: fixed incorrect control width when showing control for the first time with "Collapse Dockers" setting enabled. 
Internal: MapSet.ConvertSelection no longer selects sectors with no sidedefs when converting selection to sectors (unless those sectors were already selected).

Fixed, Visual mode: internal texture name was copied when using "Copy Texture" action on a missing texture (why would you need to copy a missing texture?..).

Visual Mode, UDMF: Change texture scale actions now try to change scale by one texture/sprite pixel at a time. Action info now also shows scaled texture/sprite size.
Info panels: float values are now formatted regardless of current CultureInfo (e.g. decimal separator is now always dot). Also, they are no longer clamped to 2 decimal places.
Updated ZDoom_ACS.cfg.

Fixed, Visual mode: ExtraFloor_LightOnly effect transferred brightness incorrectly (I broke this in r2236).
Changed, Visual mode: floors and ceilings with sky texture are now always rendered at full brightness.

Visual mode: Sector_Set3dFloor and ExtraFloor_LightOnly effects now affect sidedef brightness more similarly to GZDoom.
Visual mode, Linedef info panel: info for currently highlighted side is now shown using a different color.
Updated ZDoom_ACS.cfg.

Changed, Thing and Linedef Edit Forms, script selector drop-downs: scripts from include files are now shown using different color and after the map scripts.
Fixed, Visual mode, UDMF: sector geometry cache was not updated after using "Match Brightness" and "Change Brightness" actions on ceilings, so the changes made by them were not visible when using Classic modes in "View Ceiling Textures" mode.
Fixed, Visual mode, UDMF: "Match Brightness" and "Change Brightness" actions set brightness incorrectly in some cases.
Fixed: ACS script names gathering logic was unable to process relative #include and #import paths (like '#import "..\acs\qtilt.acs"').
Updated ZDoom_DECORATE.cfg.

Fixed, Visual mode: "Paste Texture Flood-Fill" action used long texture names regardless of current setting in Map Options.
Internal: "uselongtexturenames" setting is now stored in map settings file, not in the program configuration file.
Fixed, Color Picker plugin: in some cases mouse movement was processed incorrectly.
Fixed, Color Picker plugin: float color value output was culture settings-dependant.

Sector drawing: basic properties (textures, brightness, floor and ceiling height) are now taken from the nearest sector when a new isolated sector (e.g. a sector, which doesn't not intersect with already existing map geometry and is not inside of it) is drawn. 
Visual mode: when "Synch camera position" setting is enabled, and the cursor was outside of a sector when entering Visual mode, camera height is now adjusted based on nearest sector (previously the height was adjusted only when the cursor was inside of a sector).  
"Auto-align textures X", "Auto-align textures X and Y" actions, UDMF: alignment source sidedef part's horizontal scale is now applied to all aligned sidedefs.
Visual mode, UDMF: 'lightfog' flag is now automatically updated when changing sidedef brightness or using "Match Brightness" action. 
Linedefs mode: added "Update 'lightfog' flag" menu item.
Game configurations: cosmetic changes in UDMF linedef flag names.
Updated ZDoom_DECORATE.cfg.

Fixed, Visual mode, 3D floors: in some cases 3d floor flags were handled differently than in GZDoom.

Fixed, Edit Selection: in some cases thing angles were updated incorrectly when things with "FixedRotation" game configuration property were among selected things.
Fixed, Visual mode: floor brightness was calculated incorrectly when "Disable Light Effects"/"Restrict light inside" 3d floor flags were used and the floor had "lightfloor" property.
Fixed: "lightabsolute" flag was accessed incorrectly in previous commit.

Fixed, long texture names support: in some cases long texture names were not processed correctly when pasting map geometry.
Fixed, Visual mode: in some cases combined sidedef brightness was calculated incorrectly. Also, MAPINFO FadeColor and OutsideFogColor properties are now taken into account.
Hexen_linedefs.cfg: "Door Raise" and "Door Locked Raise" used incorrect enums for "Close Delay".