Added, DECORATE parser: damage types are now parsed.
Added: the editor now reports duplicate textures/flats/patches/sprites/colormaps/voxels in the loaded wads.
Added, all text parsers: added #region/#endregion support.
Added TERRAIN parser.
Added, Script Editor: added special handling for DECORATE special comments.
Added, Sector Edit window, UDMF: Soundsequence value was setup incorrectly when showing the window for multiple sectors with mixed Soundsequence value. 
Fixed, Map Options window: "Strictly load patches between P_START and P_END" was not applied when applying the changes.
Fixed, MAPINFO parser: MapInfo should be treated as defined when a map MAPINFO block corresponding to current map is encountered even if it doesn't define any properties recognized by the editor.
Fixed, all text parsers: in some cases error line was calculated incorrectly when reporting an error detected by a text parser.
Cosmetic: changed ' to " in the rest of Error and Warning messages.
Internal: added text resource tracking.
Updated ZDoom_DECORATE.cfg.
Updated documentation ("Game Configuration - Basic Settings" page).

Changed, Copy/Paste: the whole pasting operation is now aborted if the resulting number of sectors, linedefs, vertices or things exceeds map format's maximum.

Fixed, Map Options window: game configurations were checked in incorrect order when opening a map without a .dbs file.

Added, "Find Thing Action and Arguments" search mode: "Any action" (-1) can now be used as a search input.
Fixed, "Find Linedef Action and Arguments" and "Find Sector Effect" search modes: in some cases action/effect was checked incorrectly when performing a search. 

Added, "Find Linedef Action and Arguments" search mode: "Any action" (-1) can now be used as a search input.
Added, "Find Sector Effect" search mode: "Any effect" (-1) can now be used as a search input.
Fixed, "Find Linedef Action and Arguments" search mode: generalized actions search was broken.
Fixed, General interface: in some cases the placeholder test engine was displayed in the "Test Map" drop-down.

Added, all drawing modes: added "Continuous drawing" option (available in the top mode menu / Draw Grid panel for the Draw Grid mode). When enabled, drawing mode will not be switched to previously active mode after finishing drawing a shape.
Fixed, general interlace: in some cases "Show Editable Vertices in Visual Mode" top toolbar button showed up when using Doom/Hexen map formats.
Fixed(?), Classic modes: probably fixed an rare issue when map element dragging was not starting when supposed to.

Fixed, General interface, Statistics control: map elements count was displayed incorrectly when the number of map elements was greater than 99999.

Fixed, Texture Browser window: in some cases navigating the textures list using up/down arrows caused an exception.
Fixed, Map Analysis window: fixed an exception on copying warnings to clipboard when the clipboard was used by other application.
Fixed, TEXTURES parser: added special handling for "TNT1A0" sprite name so a texture with this sprite as a single patch is no longer treated as failed loading.
Fixed, Visual mode: in some cases (like line slopes used in several adjacent sectors) sector effect updates were triggered multiple times for the same sector, resulting in noticeable slowdowns and in some cases in infinite recursion.
Updated ZDoom ACC.

Added Preferences -> Interface -> "Keep Filter input focused when image browser is open" option. When enabled, all key presses in image browsers will be redirected to the Filter textbox.
Fixed, Texture Browser: it was impossible to scroll the textures list when selecting textures using the arrow keys.
Fixed, Texture Browser: selecting textures in the textures list using the arrow keys worked differently depending on whether the Filter textbox was focused.
Changed, Texture Browser: the control now tries to select the same item / an item close to the previously selected one when applying filtering to the textures list.

Added, Edit Things window, UDMF: added basic User Variable support. User variables are now automatically shown in the "Custom" tab, are marked with different color and are applied only to actors, which define them.
Fixed, Script Editor: auto-complete can now show the same term several times when it's case is different (like DECORATE's "Bright" keyword and "BRIGHT" flag).
Game configurations, ZDoom: updated "Scroll_Floor" and "Scroll_Ceiling" linedef action argument definitions.
Updated ZDoom_ACS.cfg (Ceiling_CrushAndRaiseSilentDist).
Updated ZDoom_DECORATE.cfg (A_SetChaseThreshold).

Fixed, Tags selector, UDMF: tags from sector with the longest array of tags was applied to sectors with shorter arrays of tags.
Fixed, Draw Settings panel: sidedef texture overrides were not applied when "Auto-clear sidedef textures" setting was enabled.
Added, Thing Edit window, UDMF: added "Show user-added custom fields only" checkbox.

Fixed a case when TEXTRES image was trying to load itself as a patch, which resulted in an infinite loop.
Cosmetic: standardized the way resource names are displayed in warning/error messages in the Errors and Warnings window.

Script Editor, Script Editor configurations: added additional keywords category for properties/operators. Added a separate color for those as well.
Fixed, Script Editor: auto-completion and syntax highlighting now works for properties with dots (like "Powerup.Color") and colon (like "See:").
Fixed, Linedef info panel, Hexen map format, cosmetic: activation type should be enabled when the line has an action assigned, even if it's default activation.
Updated ZDoom_linedefs.cfg (Line_SetPortal).

Re-fixed, Visual mode: in some cases some D3D textures were not disposed after closing a map, eventually resulting in E_OUTOFMEMORY crash.
Fixed, Preferences window: some folding settings were not applied in the Script Editor preview control.
Changed, Visual mode: increased z-buffer depth to 24 bits. Z-fighting among far away but close to each other surfaces should be less noticeable now.

Added, Script Editor: caret position, scroll amount and fold state are now saved for every opened file when closing the Script Editor. Currently selected tab is saved as well.

Fixed, Things mode: Undo for things cloning by Shift-dragging them was created incorrectly (cloned things were moved to their initial position, but not removed).
Fixed, Visual mode: fixed Classic sky texture generation artifact when Bilinear filtering was enabled in Visual mode.
Fixed, Visual mode: fixed Classic sky texture generation artifact when non-power-of-2 Sky textures were used.
Fixed, Visual mode: dynamic lights flickering on surfaces nearly-perpendicular to lights centers should be much harder to trigger now.

Fixed a crash when using "Open map in current WAD" action when trying to reload any ZDoom text lump (as it turned out, implementing IDisposable in ZDTextParser was not such a bright idea...).

Fixed, Script Editor, ACC: auto completion for keywords starting with "#" char was not handled properly.
Fixed, Script Editor: replaced the native Scintilla library with the one supplied with SciTE 3.6.2. The Script Editor should now work on Windows XP.
Changed, Script Editor, search: all fold blocks are now unfolded when search result is inside a folded block.
Updated ZDoom_ACS.cfg.
Updated ZDoom_DECORATE.cfg.
Updated ZDoom ACC to git rev. 6bb023d.

Fixed, Visual mode: some video memory was not released after closing a map if the Visual mode was enabled at least once during the editing session, eventually resulting in E_OUTOFMEMORY crash.
Fixed, General interface, cosmetic: in some cases the warnings label was disabled in a flashing state (e.g. with red background).
Internal: moved some older GZDB actions form GZGeneral to MapManager. They can no longer be toggled when no map is loaded (which is probably for the best).
Updated ZDoom_ACS.cfg.
Updated ZDoom_DECORATE.cfg.

Fixed, Script Editor: "Save screenshot" action were processed twice when the Script Editor window was open.

Preferences: moved Script Editor settings to a separate page, added a bunch of new Script Editor settings.
Changed: Script Editor no longer converts typed constants to uppercase.
Changed: when "Auto indent" is enabled, Script Editor no longer adds additional indentation to a line after closing brace.

Fixed, Script Editor: text styling was not applied to existing text after changing script configuration.

Updated Scintilla control to ScintillaNET 3.5.6 (https://github.com/jacobslusser/ScintillaNET). Scintilla.dll is no longer used by GZDB and can be safely removed.
Changed, Script Editor: pressing Ctrl-S when fixed compilable script tab (like SCRIPTS tab) is selected now compiles the script.
Fixed, Error Logger: fixed slowdowns when adding lots of errors and "Errors and Warnings" window was opened.
Fixed, Script Editor: text caret was incorrectly positioned after selecting a function in the navigator dropdown.
Fixed, Script Editor: incorrect ACS configuration was used for SCRIPTS lump for maps in Hexen map format for ZDoom-based engines.
Internal, rendering: added more error reporing-related code to D3DShader.LoadEffect().
Updated ZDoom_DECORATE.cfg.

Added, Visual mode: "Raise/Lower Floor/Ceiling to adjacent Sector" actions now take surrounding 3d floors into account.
Added, Visual mode: highlight/selection based on texture alpha now works on 3d floors.
Changed, Game configurations, TranslucentLine:208 action: renamed the second argument from "Translucency Amount" to "Opacity".
Internal, documentation: updated udmf_zdoom.txt.

Fixed, DB2 bug: hlsl effect stream was not rewound when trying to compile it in debug mode, which resulted in always receiving IndexOutOfRangeException when trying to do it.
Fixed, Visual mode: textures on floors, ceilings and single-sided wall parts are now rendered ignoring texture alpha.
Changed, Game configurations, Sector_Set3dFloor:160 action: renamed the fourth argument from "Alpha" to "Opacity".

Fixed, Visual mode: in some cases ceiling glow effect was interfering with Transfer Brightness effect resulting in incorrectly lit sidedef geometry.
Fixed, Visual mode: UDMF sidedef brightness should be ignored when a wall section is affected by Transfer Brightness effect.
Fixed, Visual mode: any custom fog should be rendered regardless of sector brightness. 
Fixed, Visual mode: "fogdensity" and "outsidefogdensity" MAPINFO values were processed incorrectly.
Fixed, Visual mode: in some cases Things were rendered twice during a render pass.
Fixed, Visual mode: floor glow effect should affect thing brightness only when applied to floor of the sector thing is in.
Fixed, TEXTURES parser: TEXTURES group was named incorrectly in the Textures Browser window when parsed from a WAD file.
Fixed, MAPINFO, GLDEFS, DECORATE parsers: "//$GZDB_SKIP" special comment was processed incorrectly.
Fixed, MAPINFO parser: "fogdensity" and "outsidefogdensity" properties are now initialized using GZDoom default value (255) instead of 0.

Updated ZDoom ACC.
Updated ZDoom_ACS.cfg.
Updated ZDoom_DECORATE.cfg.

Fixed a crash when trying to parse an empty TEXTURES lump (probably covers some other empty text lumps as well).
Added strict revision checking to BuilderModes.dll (this plugin must always stay in sync with the core).

Fixed, Map conversion: game mode flags were ignored when converting from Doom map format to UDMF.
Fixed, Edit Selection mode: when "Drag selection automatically on paste" setting was enabled, it was possible to start rotating/scaling map elements instead of dragging them after pasting.

Changed, "Open map in current wad" action: current map resources are now carried over to the map being switched to.

Fixed, Visual mode: fixed a crash when creating classic skybox texture when sky texture's height was less than 28 pixels.

DECORATE support: added a warning when a sprite assigned using "$sprite" special comment does not exist. 

Fixed, Edit Thing window: fixed a crash when entering thing type in the Type field when a filter was applied to the things list.
Fixed, MAPINFO parser: in some cases the parser was skipping the whole file instead of current map block while parsing classic map definition.
Fixed, Visual mode: classic sky model had incorrect rotation.

Fixed, Visual mode: fixed inability to drag auto-selected sidedef parts using mouse when "Synchronize selection between Visual and Classic modes" setting was enabled.
Fixed, Visual mode: fixed incorrect auto-selected sidedefs texture offset clamping when "Synchronize selection between Visual and Classic modes" setting was enabled.

Fixed a crash during skybox textures search when searching for any image and not finding it in the first PK3 or Directory resource.
Fixed: TGA image detection required a special approach...
Fixed, Visual mode: built-in sky texture should not be mirrored like the classic ones.