Optimization, PK3: approximately 2x performance increase during background resource loading (~7 seconds vs ~16 seconds in r2083, tested on Enjay's Genetech MAP01).
Fixed, PK7: fixed a potential crash when using several PK7 resources with overlapping files.

Internal: added General.Interface.ActiveDockerTabName property.

Changed, Directory/PK3/PK7: on second thought, we don't need to load textures/flats from all possible locations (does anyone really needs to see sprites and graphics in the texture browser?), so this logic now only works when looking for patches.
Game Configurations: added "Custom Ambient Sound (no gravity)":14067, added a couple of missing parameters to other sound-related things.

Fixed, Directory/PK3/PK7 image loading: we should use DoomTexture as expected format when loading flats from non-"Flats" folders.

Changed: both DoomTexture and DoomFlat formats should be checked when determining an image format if "Mix textures and flats" flag is set.
Changed: "imgz" images are now skipped while loading textures.

Fixed, Textures Browser form: fixed another case of the blank textures list after opening the form.

Textures Browser form: empty texture sets are no longer shown when mixed textures & flats is disabled in the current game configuration.
Textures Browser form: PK3/Directory TEXTURES images are now shown in a separate folder in the resources tree.
Fixed, Textures Browser form: fixed a logic error when trying to select initial flat when mix textures & flats was disabled in the current game configuration (this resulted in the blank textures list after opening the form).
Fixed, Textures Browser form: resources tree showed textures count even when browsing flats.
Fixed, Textures Browser form: PK3/Directory textures took precedence even when browsing flats (this means when there were a flat and a texture with the same name, a texture was displayed when browsing flats).
Fixed, Classic modes: actor's scale set in DECORATE was ignored when rendering models.
Fixed, MODELDEF parser: in some cases, several model definitions were skipped when trying to skip the current one.
Fixed, resource management: flat and sprite TEXTURES definitions were loaded only from TEXTURES files named "TEXTURES".
Fixed/added, PK3/folder resource management: patch locations for sprites defined in TEXTURES are now checked the same way as in ZDoom (previously only the "sprites" folder was checked).
Fixed/added, PK3/folder resource management: patch locations for textures defined in TEXTURES are now checked the same way as in ZDoom (previously only the "textures" folder was checked).
Fixed, PK3/folder resource management: flats defined in TEXTURES were not added to the global Flats image list.
Fixed, PK3/folder resource management: in some cases, the image search algorithm could find flats, textures, patches or sprites in incorrect folders (for example, it could find a flat in "flats_backup" folder).

Fixed: VirtualSectorField was cleared from sector properties when pasting map geometry in Doom/Hexen map formats leading to incorrect sector assignment [I broke this in r2009, so it seems].

MakeSVNRelease.bat: changed log start revision from 1 to 1496 (GZDB's second commit).

Fixed, Classic modes: Alt-dragging map elements (e.g. "snap to grid increment while dragging" mode) was not working properly.

Map Analysis, internal: some ErrorCheckers and ErrorResult had inconsistent namespaces.
Thing Edit forms, internal: optimized missing flags check a bit.

Thing Edit Form: a warning is now displayed when a thing doesn't have any skill or class or game mode flags.
Game Configurations: moved "thingflagscompare" from Game to Map format blocks. "Check stuck things" check now works properly in Doom/Boom game configurations.
Map Analysis: fixed a possible crash during "Check texture alignment" check.
Map Analysis: ResultStuckThingInLine now highlights both thing and line.
Map Analysis: ResultStuckThingInThing now highlights both things and allows to delete any of them.
Internal, Map Analysis: rewritten parts of "Check stuck things" class.
Internal, Map Analysis: changed the way processed stuff is stored in "Check texture alignment" class.
Internal: changed CurrentDomainOnUnhandledException, so ExceptionDialog with proper info shows up even if adding exception to the Event Log failed.
Internal: changed format, in which thingflagscompare info is stored.

Fixed incorrect syntax in ZDoom_DECORATE.cfg.

Map Analysis form: fixed a crash caused by running analysis, opening another map then trying to run analysis again.
Map Analysis form: error checks are now alphabetically sorted.
Map Analysis form: added "Toggle All" check box.
Internal: CheckboxArrayControl now has Sort() method.
More fixes in ZDoom_DECORATE.cfg

Scripting: added A_DamageSelf, A_DamageTarget, A_DamageTracer and CheckClass definitions, fixed a bunch of inconsistencies in ZDoom_DECORATE.cfg.

Cosmetic: changed Angle Control's outline color.

Added: Map Analysis: added "Check texture alignment" check. Currently it works only in Doom/Hexen map formats.

More changes in ZDoom_linedefs.cfg.

Fixed: Drag Geometry Mode: dragged sectors, linedefs or vertices were snapped to 0, 0 in some cases when trying to snap them to a linedef fully inside of a grid cell.

Fixed: Visual mode: "Select" action with "with the same textures" / "with the same height" modifiers (Shift/Ctrl + LMB) was not working properly when used on vavoom-type 3d floor sidedefs.
Fixed: Visual mode, UDMF, "Auto-align textures" actions: vertical texture offset was calculated incorrectly for vavoom-type 3d floors.

Visual mode: "Select" action with "with the same textures" / "with the same height" modifiers (Shift/Ctrl + LMB) now works properly with vavoom-type 3d floors.

Visual mode: "Select" action with "with the same textures" / "with the same height" modifiers (Shift/Ctrl + LMB) now works when used on floors and ceilings of a 3d floor.

MODELDEF parser: fixed a crash when trying to add a model definition when another one was already created for the same actor.
ZDoom_DECORATE.cfg: added A_SetSpeed definition.

Visual mode: vertex handle size is now updated after closing the Preferences form.

Preferences Form: renamed "Scale models in visual modes" to "Stretched view in visual modes". When enabled, this setting now increases vertical scale of the world and sprites in visual mode instead of decreasing vertical scale of models.

Sector slopes were not copied by "Copy Properties" actions and were missing from Paste Properties Options form.
Added several missing flags to ZDoom_DECORATE.cfg.

Visual mode: "Select" action with "with the same textures" / "with the same height" modifiers (Shift/Ctrl + LMB) now works when used on sides of a 3d floor.
Visual mode: "Select" action with "with the same textures" modifier (Shift + LMB) now selects adjacent sidedefs only when their height intersects with the height of the current sidedef.
Visual mode: "Select" action with "with the same textures" modifier (Shift + LMB) was not selecting connected one-sided sidedefs when used on a sidedef without a texture.
Cosmetic: fixed a couple of action descriptions in BuilderModes' Actions.cfg.
Cosmetic: MainForm.UpdateToolStripSeparators was working incorrectly in some cases.
Cosmetic: ErrorChecksForm's title was not updated when no errors were found.

Reformatted debug output from previous commit so it no longer generates compilation warnings when compiling in Release mode.