Visual mode: rewritten most of the 3d floor clipping and light/color assignment logic. As a result, 3d floors should look much closer to what's seen in GZDoom.
Fixed, Visual mode: glow effect was not updated when changing sector textures using the "Select Texture" action.
Browse Textures/Flats window: when textures list is focused, you can now start typing to change the Filter.

Fixed, Visual mode, UDMF: incorrect texture name was copied when using "Copy Texture" action when copying a texture stored in a folder resource when "Use long texture names" settings was enabled.

MODELDEF support: model frame number / frame name are now taken into account when loading MD2 models.
Compiling: changed the way /LARGEADDRESSAWARE flag is applied so it works when building using VS and batch files.

Thing Browser Control: fixed cosmetic focusing issue. When Things list is focused, you can now start typing to change the Filter.
Edit Action window: Actions list is now automatically focused on mouse over. When Actions list is focused, you can now start typing to change the Filter.
Edit Effect window: Effects list is now automatically focused on mouse over. When Effects list is focused, you can now start typing to change the Filter.
Game Configurations: added "Gold Wand" to all ZDoom-based Heretic configurations (also a couple of cosmetic tweaks).
Game Configurations: changed "Pistol" display sprite to the one provided with (G)ZDoom.

Fixed, Linedef Color Presets window: Linedef Actions and Linedef Activations lists were accidentally modified during window initialization.

Fixed, Script Editor: in some cases includes list was not updated before trying to compile the script leading to compilation failure.
Changed, ACC compiler: when building includes list, the compiler no longer tries to find/copy include files defined in current script configuration (previously it was hardcoded to skip "zcommon.acs" and "common.acs" only).
Fixed, Visual mode: things with Additive RenderStyle were rendered as additive only when their alpha was less than 1.0.

Fixed: in some cases the editor was unable to determine which sector a Thing is located in when such thing was placed on top of a linedef between 2 rectangular sectors.

Fixed, Visual mode: fixed a crash when trying to render a Thing with translucent or additive renderstyle outside of any sector.
Fixed, Classic modes: 3d floor linedef indicators shown in Classic modes were not updated after finishing sector drawing.
Updated ZDoom ACC to git rev. f92fbb9.
Updated ZDoom_ACS.cfg.

Fixed: 3d floor linedef indicators shown in Classic modes were not updated when 3d floor creation was undone in Visual mode.
Performance optimization when selecting sectors in Sectors mode with "Synchronized Things selection" setting enabled. 

Sectors mode: removed "Move Things in Selected Sectors" toolbar button.
Sectors mode: added "Synchronized Things Editing" menu item, action and toolbar button. When enabled, things dragging will be synchronized to sector dragging. Regular, Paint and Rectangular selection will also select things (holding Alt while selecting inverts this behavior). Deleting sectors will also delete selected things.
Linedefs mode: added "Synchronized Things Editing" menu item, action and toolbar button. When enabled, selected things will be dragged when dragging linedefs. Rectangular selection will also select things (holding Alt while selecting inverts this behavior).
Changed: selection info now always displays info about all types of map elements.
Fixed: .dbs containing only current map settings was created when trying to save unchanged map. 
Fixed, Visual mode, "Copy Texture" action: when "Use long texture names" option is disabled, texture name as stored in Sidedef should be used, not the 8-char texture name.
Updated documentation.

Fixed, Visual mode: size override thing argument types were not taken into account when creating thing bounding box geometry.

Fixed, Visual mode, DB2 bug: Visual Camera Thing's (32000) vertical position was always set to -41 when switching from Visual mode if the camera was not inside a sector.

Fixed: only one test engine should be launched from the editor at any given time.
Changed: SVN builds now include debug symbols.
Internal: VersionFromSVN.exe can now work from a network drive.
Updated ZDoom ACC to git rev. 3071c32.
Updated ZDoom_DECORATE.cfg ("A_Warp").

Updated Inno Setup file.

Some cosmetic tweaks to GZBuilder.default.cfg.

Fixed: "Sectors -> Select Things in Selected Sectors" menu item was not triggering the appropriate action.
Fixed: "Select Things in Selected Sectors" action was clearing selected sectors without updating the display.
Changed, Sectors mode: number of selected things is now displayed in the info panel.
Changed, Game Configurations window, "Testing" tab: game engine executable browser now opens up when clicking the "Add game engine" button.
Changed, Game Configurations window, "Testing" tab: default game engine display name is now generated from the folder name game engine executable is in.
Changed, Visual mode: Sector_Outside (87) sector effect is now taken into account when determining sector fog color.
Game configurations: added "defaultwalltexture", "defaultfloortexture" and "defaultceilingtexture" parameters. These define textures used when drawing a sector (usually the first sector of a map only).
Game configurations: classic game configurations now use "-warp" command to load the map.
Game configurations: factorized testing parameters into "Includes\Test_params.cfg".
Added internal functions to Hexen acs scripting configuration.
Updated documentation ("Game Configuration - Basic Settings" topic).

Added "makedoorceil" game configuration property. Works the same way as "makedoortrack" and "makedoordoor", but for ceilings of door sectors. 
Changed, Game configurations: the editor no longer tries to load DECORATE/MODELDEF/VOXELDEF/GLDEFS/REVERBS lumps when "decorategames" setting is not specified / is set to empty string.
Changed, General interface: "Tools -> Reload MODELDEF/VOXELDEF" and "Tools -> Reload GLDEFS" menu items are no longer shown when current game configuration doesn't support DECORATE. 
Fixed a crash when pasting linedef/thing properties in Hexen map format.
Fixed, Visual mode: Visual Thing resources were not fully unloaded when resetting D3D device leading to crash when switching to the editor from a DX-using game engine (like ZDoom) running in fullscreen.
Fixed: in some cases, when current game configuration supported multiple script compilers, it was possible to open/create a map or change map options without selecting any script compiler.
Fixed, New Map Options window: default map name was not updated when switching game configurations.
Fixed: copied map element properties were not reset after switching to another map.
Fixed: stored textures for "Make Door" action were not reset after switching to another map.
Fixed, Game Configurations window: currently selected test engine name was not updated when pasting test engines from another configuration. 
Fixed, Game Configurations: all "Heretic in Doom map format" configurations were using Doom sector effects list.
Fixed, Game Configurations: all "Strife in Doom map format" configurations were using Doom sector effects list.

Fixed, DB2 bug: scaled size of a texture is an integer value in ZDoom, so we should also treat it as such.

DECORATE: added "$obsolete" special comment. When present, it marks the thing as obsolete. It will be detected by "Check obsolete thing" Map Analysis Mode check and will be marked in the Thing Properties Window and the Thing Info panel.
Map Analysis mode: added "Check obsolete things" check.
Updated documentation ("DECORATE keys" page).
Updated ZDoom_DECORATE.cfg.

Changed: when entering Visual mode, the camera is no longer positioned at "Visual Mode camera" thing when "Sync camera position between 2D and 3D mode" setting is enabled.
Changed: Visplane Explorer plugin is now initialized only in Doom/Hexen map formats.
Fixed, Visual mode: thing cages were not rendered when things didn't have a sprite.
Fixed, Internal, DB2 bug: Plug.Dispose() was never called.

Added "Paste Properties Special" actions in "Classic" and "Visual" categories. They work the same way as "Paste Special" action.
Added: "Copy Properties", "Paste Properties" and "Paste Properties Special" options are now shown in the Edit menu if current classic mode supports them.
Changed, Paste Properties Special window: only options relevant to current map format are now displayed.
Changed, Paste Properties Special window, UDMF: all UI-managed options are now available.
Fixed: MAPINFO parser was unable to process "include" directives.
Fixed, General interface: selection info was reset to "Nothing selected" after few seconds regardless of current selection.
Fixed, Visual mode: thing bounding boxes were not updated when changing things positions using Randomize mode.
Fixed, Visual mode: event lines were displayed at incorrect height when entering Visual mode for the first time.
Fixed, Texture Browser window: when MixTexturesFlats Game Configuration option is disabled, textures/flats are no longer shown in the Used group when flats/textures with the same names are used in the map. 
Fixed(?): probably fixed an exception some users reported when trying to initialize a Classic mode after switching from Visual mode with "Sync cameras" option enabled.
Changed, Game configurations, Thing Categories: a block must have at least one thing category property to be recognized as a thing category.
Changed, Visplane Explorer: the plugin now outputs more info when it fails to initialize vpo.dll.
Cosmetic, Thing Edit window, Doom/Hexen map format: adjusted UI layout so thing flags control no longer displays scrollbars in Hexen map format.
Internal: merged methods from UDMFTools into UniFields, removed UDMFTools. 
Updated Inno Setup script (added VC++ 2008 SP1 distributive). 
Updated ZDoom_DECORATE.cfg (A_CheckBlock).
Updated documentation (added "System Requirements" page).

More detailed info is now saved to the log file (GZBuilder.log) when an editing mode fails to initialize.
General interface: added "Help -> Program Configuration Folder" menu item.

Visual mode: fog distance calculation is now much closer to GZDoom one.
Visual mode: thing brightness calculation when a thing is affected by floor glow is now much closer to GZDoom one.
Linedef edit window, UDMF: added "Reset front/back brightness" buttons.
Sector edit window, UDMF: added "Reset ceiling/floor brightness" buttons.
Internal, Visual mode, Things mode: persistent event lines are now updated only when map objects are changed instead of doing it on every display redraw.
Internal: improved Dictionary lookup times when using map objects and textures as keys.
Internal: added "Release + Profiler" solution configuration.
Updated ZDoom_ACS.cfg (Warp).

Fixed, UDMF parser: parser failed to parse decimals stored using scientific notation (like "1E-06").
Fixed, UDMF parser: incorrect line numbers were shown when displaying errors.
Changed, UDMF parser: many error descriptions are now more detailed.
Updated ZDoom ACC to Git rev. ae5f036.

"Fixed", DECORATE parser: looks like treating missing parent class as an error was way too overwhelming to some users, so parsing is no longer aborted and a warning is added instead of an error.

Added, Visual mode, DECORATE: "RenderStyle" property is now partially supported.
Added, Visual mode, DECORATE: +BRIGHT flag is now supported.
Added, Visual mode, UDMF: "Alpha" thing property is now supported.
Added, Visual mode, UDMF: "RenderStyle" thing property is now partially supported.
Added, Visual mode, Hexen map format and UDMF: "Translucent" and "Invisible" thing flags are now supported.
Added, Game Configurations: added "alpha" and "renderstyle" Thing and Thing Category properties.
Fixed, Visual mode: blockmap was not updated when moving things using "Move Thing Left/Right/Forward/Backward" and "Move Thing to Cursor Location" actions.
DECORATE parser: added a warning when unable to find actor's parent class.
Internal: current map format can now be checked using "General.Map.UDMF", "General.Map.HEXEN" and "General.Map.DOOM" properties.
Updated documentation ("Game Configuration - Things Settings" page).

Fixed: "Open map in current wad" action was accidentally broken in R2403.

Added emergency map backup system (EMBS). When the editor crashes, it will try to export a backup copy of the map structures. When the same map is loaded again, it will ask the user if he wants to restore the map.
High-DPI: fixed many issues with incorrect controls size (Tag selector width, Comment Editor size, icons size, tabs size etc.).
Cosmetic: changed map geometry dragging undo messages to more descriptive ones.
Fixed, Textures Browser, cosmetic: "Show textures in subdirectories" checkbox should be repositioned when "Long texture names" one is invisible.
Updated ZDoom_DECORATE.cfg (added A_SetFloatSpeed + a couple of fixes).

Fixed, Visual mode, Auto-align actions: incorrect texture was used when clamping texture offsets of 3D floor sides.
Fixed, Numeric textbox: incorrect character was treated as decimal separator character was used when using certain Windows regional settings.
Changed, Edit Things window: when applicable, the "Filter" textbox is now focused when opening the window.
Changed, Sector Effects browser window: when applicable, the "Filter" textbox is now focused when opening the window.
Changed, Edit Things window: when the "Filter" textbox is focused, pressing the "Down" key will now switch focus to the Things list.
Changed, Sector Effects Browser window: when the "Filter" textbox is focused, pressing the "Down" key will now switch focus to the Effects list.
Changed, Linedef Action Browser window: when the "Filter" textbox is focused, pressing the "Down" key will now switch focus to the Actions list.
Configurations, Doom map format thing flags: changed "Multiplayer" flag name to "Multiplayer only".

Added some boilerplate to the rendering system. It's now impossible to start new rendering cycle if the previous one hasn't finished yet.
Changed: OS name, GPU name and GZDB revision info are now added to the exception text and GZCrash.log.
Fixed, cosmetic: toolstrip separators visibility must be updated when resizing the main window.
Internal: removed Plug.DisplaySize, Plug.DisplayLocationAbs and Renderer.ViewportSize. The same data can be accessed from anywhere using General.Interface.Display.Size and General.Interface.Display.LocationAbs. Also Plug.DisplayLocationAbs returned incorrect coordinates...

Changed, Drag Things mode: things position is now snapped to integers after finishing dragging. Also removed some unneeded update code.
Fixed a crash when deleting sectors (introduced in R2399).

Added, Texture Browser: added "Show textures in subdirectories" checkbox (enabled by default). When enabled, textures from current PK3/PK7/Directory resource directory and it's subdirectories will be shown. Otherwise, only textures from current directory will be shown.
Removed, Texture Browser: removed "Show image sizes" checkbox. "Show texture and flat sizes in browsers" preferences setting is now used instead.
Fixed, Things mode: event line between pre-last and the last PatrolPoint was not drawn.
Fixed, Things mode: highlight range for sizeless things (things with "fixedsize" game configuration property) was calculated incorrectly.
Fixed: fixed a crash when opening Script Editor after using "Open map in current wad" command to switch to UDMF map with SCRIPTS lump when current script configuration was not saved in the wad's .dbs file.
Fixed: map closing events were not triggered when using "Open map in current wad" command, which could potentially result in plugin crashes/incorrect behavior.
Fixed: Sector Drawing overrides panel could trigger an exception when closing the map during resource loading.
Internal: added "Debug + Profiler" solution configuration, added 2 profiling methods to DebugConsole.
Internal: rewrote MainForm.DisplayStatus() / StatusInfo to handle selection info in a more structured way.
Fixed, internal: some destructors could potentially be executed more than once potentially leading to exceptions. Other destructors were not called at all.
Updated ZDoom_DECORATE.cfg.

Fixed: map file lock check was performed in incorrect place leading to always reporting the map file as locked on Windows XP.
Fixed, DB2 bug (partially): 4 settings were reset to the state saved in the program configuration after applying the changes made in the Preferences window.
Fixed: several Brushes were not disposed in ImageBrowserItem (DB2 bug) and ColoredComboBox, resulting in a very slow memory leak.
Fixed, Linedefs Mode, cosmetic: incorrect distance was used when calculating vertex insert preview opacity.
Changed, Script Editor: disabled indentation guides.

Fixed, "Synchronize selection between Visual and Classic modes" setting: vertex selection synchronization was not working when switching from Visual to Classic mode. Also fixed a typo in the setting's name.
Fixed, StairSectorBuilder mode: settings form still used "Cancel OK" button order.

Added, Classic modes: default thing arguments are now taken into account when highlighting related map elements.
Probably fixed an exception when trying to check which program(s) lock the map file on Windows XP.
Changed: added an option to try to close all programs, which lock the map file when saving the map and the map file is locked (requires Windows Vista or newer).
Fixed, Preferences window: some trackbars had incorrect background color.
Fixed, General interface: in some cases status messages were almost immediately replaced by selection info messages.

Changed: when the editor is unable to save the map, it will now display the list of processes, which lock the map file.
Fixed, Update Checker: the existence of Updater.exe and Updater.ini was not checked when using Help -> Check for updates command.

Added: Auto-updater window now has "Ignore this revision" checkbox. If enabled, the window will show up only if a newer update is available. 
Fixed, Edit Selection mode: sector highlight was not updated when switching from Edit Selection to Sectors mode.
Fixed, Edit Selection mode, UDMF: in some cases texture scale Y was flipped when applying/canceling changes made in the mode.
Probably fixed a crash caused by uninitialized Association when highlighting map elements.
Fixed, Comments Panel plugin: selection info was not updated when selecting map elements in the side panel.
Fixed, Tag Explorer plugin: selection info was not updated when selecting map elements in the side panel.
Fixed a typo in Hexen_things.cfg.

Fixed: in some cases the number of generalized sector effects displayed in Sector info panel and action selector control was calculated incorrectly.

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.