Externalized most of the editor's built-in textures. You can find (and replace) them in the "[GZDB]\Textures" folder.

Fixed a typo.

Fixed a crash after pressing "Edit Selection" button in the Find and Replace window when several instances of the same map element were selected.
Redesigned the Test Map button's drop-down: test engines are now shown and behave the same way as skills and also have appropriate icons. 

Fixed, Thing/Linedef edit forms: fixed a crash during form setup when Action was either unknown or generalized.
Fixed, ANIMDEFS parser: in some cases the parser was unable to read camera texture name.

Fixed, Map Analysis mode, "Check stuck things" check: rewritten parts of the flags checking logic to allow more accurate flag checks.
Fixed, Map Analysis mode: fixed a crash when trying to dissolve an invalid sector when one of it's linedefs referenced it on the both sides.
Fixed, Sectors mode: fixed incorrect undo description when deleting sectors.
Internal: joined declaration and assignment of some more variables.

Internal: joined declaration and assignment of some variables.

Fixed, GLDEFS parser: in some cases the parser was unable to detect the end of "Glow" block, which resulted in skipping the rest of the file.

Updated ZDoom ACC and ZDoom_ACS.cfg (added GetInventoryMax()).

Fixed, ACS parser: absolute and relative include paths handling was broken in R2448.

Fixed, ANIMDEFS parser: camera texture names are limited to 8 chars in ZDoom.
Fixed, Game configurations: Stalagtite:47 thing was named Stalagmite.
Changed, Game configurations: moved Stalagmite:5050 thing to the "Obstacles" category.

Some internal changes in text parsers logic.

Fixed, Script Editor: in some cases clicking on an error in the errors list didn't navigate to the error location.
Fixed, Script Editor: in some cases incorrect error line number was shown.
Fixed, Text lump parsers: fixed a crash when trying to get a filename from a quoted string with missing closing quote.
Fixed, Text lump parsers: in several cases parsing errors were ignored by overlaying data structures.
Fixed: in some cases Thing Filter thing flags were cleared when switching game configurations in the "Game Configurations" window.
Changed, PK3 reader: loading of files with invalid path chars is now skipped instead of skipping loading of the whole resource. Also more helpful warning message is now displayed.
Updated SharpCompress library to v.0.11.2.0.

Added, Things mode: dynamic light things light radii are now rendered (can be disabled by setting "Dynamic light mode" to "Don't show dynamic lights" on the top toolbar).
Internal, Renderer2D.RenderArrows(): only visible lines are now rendered.
Internal, API: renamed public Line3D properties: v1 to Start, v2 to End, color to Color, renderarrowhead to RenderArrowhead.

Changed, Renderer2D: StartOverlay() now works the same way as StartPlotter() and StartThings() (e.g. returns false when unable to render instead of throwing an Exception. Should prevent crashes for people with slow GPUs / very complex maps).

Changed, "Select Similar", "Paste Properties Special" actions properties windows, Linedefs: removed "Sidedef Properties" from Linedef flags tab.
Fixed several issues with "Synchronized Things Selection" setting:
- Things were not deselected after dragging a single sector.
- Things were not deselected after editing properties of a single sector.
- Things sector references were not updated after using "Join Sectors" and "Merge Sectors" actions.
- Things (de)selection is now applied to all things, instead of only the ones visible using current Things Filter.

Cosmetic, actions: renamed "Lower Floor/Ceiling by 8 mp" to "Lower Floor/Ceiling/Thing by 8 mp", "Raise Floor/Ceiling by 8 mp" to "Raise Floor/Ceiling/Thing by 8 mp", "Lower Floor/Ceiling by 1 mp" to "Lower Floor/Ceiling/Thing by 1 mp", "Raise Floor/Ceiling by 1 mp" to "Raise Floor/Ceiling/Thing by 1 mp", "Lower Floor/Ceiling to adjacent sector" to "Lower Floor/Ceiling/Thing to adjacent Sector/Thing", "Raise Floor/Ceiling to adjacent sector" to "Raise Floor/Ceiling/Thing to adjacent Sector/Thing".
Updated, Visual mode, "Raise Floor/Ceiling/Thing to adjacent Sector/Thing" / "Lower Floor/Ceiling/Thing to adjacent Sector/Thing" actions: sectors across targeted sectors are now taken into account when determining target height.
Updated, Visual mode, "Raise Floor/Ceiling/Thing to adjacent Sector/Thing" / "Lower Floor/Ceiling/Thing to adjacent Sector/Thing" actions: the actions can now stack things on top of other things when their bounding boxes intersect. 
Internal: cosmetic changes to shader update logic.
Internal: thing bounding box is now used when adding a thing to VisualBlockMap.

Fixed, Doom -> Hexen map format conversion: SP/Coop/MP flags were lost during Thing flags conversion resulting in Things not showing in any game mode.

Fixed, Visual mode: fixed a crash when showing Edit Vertex window when several selected vertices belonged to the same sector.

Fixed, Texture browser: "Show textures in subdirectories" setting was not applied to the root directory.
Changed, Image formats: GIF images will no longer be loaded, because (G)ZDoom doesn't support them.
Updated ZDoom_DECORATE.cfg.
Updated ZDoom_ACS.cfg.
Updated ZDoom ACC.

Fixed, Visual mode: in some cases fog density of 3d floor floors/ceilings was calculated incorrectly. 

Fixed, Visual mode, "Auto-align textures" actions, UDMF: vertical offsets of non-wrapped middle textures should not be clamped.
Fixed, Visual mode: brightness of 3d floors with "disable lighting" flag was calculated incorrectly.
Fixed, Sectors mode: 3d floor linedef indicators were not updated after using "Join Sectors" and "Merge Sectors" actions.

Fixed, Visual mode, fog rendering: things with Bright setting should still be affected by custom fade.
Updated ZDoom_DECORATE.cfg.

Added: Tab text now looks differently when appropriate script was changed.
Added: Script Editor now has it's own status bar.
Added: several files can now be opened at once when using "Open File" command.
Added: ACS scripts navigator now shows script and function arguments.
Changed: when closing a tab, previous tab is selected instead of the first tab.
Changed: SCRIPTS lump can't be compiled as a library.
Changed: external acs files can only be compiled as libraries.
Changed: when an external acs file is marked as #library, it will be saved as [library name].o alongside [filename].acs.
Fixed: files opened using "Open File" command were immediately flagged as changed.
Fixed: Script Editor was unable to navigate to error location after clicking on the error description when the error was in include file.
Updated ZDoom ACC.

Fixed, Visual mode: fixed incorrect GLDEFS glow brightness calculation for Things.
Updated ZDoom_DECORATE.cfg.

Fixed, Script Editor, cosmetic: we should not show error line number when we don't have one.
ZDoom acc.exe: several error types now output more detailed info.
Fixed, Visual mode: UDMF thing alpha property was applied only when UDMF renderstyle property was also set (should also be applied when renderstyle property is set in the DECORATE actor definition).
Game configurations, ZDoom family: Pistol and Gold Wand actors now use internal sprites.
Updated ZDoom ACC and ZDoom_ACS.cfg (PickActor flags).

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.