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.

The editor will fail more gracefully when no D3D device is detected.
In some cases the editor was constantly checking D3D device availability when minimized.
Added more DX-related debug output (only in Debug builds). 

Fixed: certain UDMF-only properties were not cleared when pasting map elements from UDMF to non-UDMF maps.
Fixed a bug introduced in r2043: helper objects were not updated in some cases.

More changes to Hexen_linedefs.cfg and ZDoom_linedefs.cfg.

Preferences: added "Vertex scale (3D)" preference, renamed "Vertex scale factor" to "Vertex scale (2D)".

Linedef Edit Form, UDMF: missing activation flags warning is now displayed only for linedef actions with "requiresactivation" property set in a game configuration.
Game configurations: fixed a couple of property names, added more enums & default values.
Updated BCC compiler to rev. 20140818r2.

Linedef Edit Form, UDMF: added less annoying warning about missing activation flags (no checks if an action actually requires activation yet...)

Sector Edit Form (UDMF): sector brightness value was processed incorrectly when relative value was entered.
Internal: added "ButtonStepsWrapAround" property to ButtonsNumericTextbox.
Internal, SectorEditFormUDMF: more changes to Slopes tab. Still not operational... 

Sector Edit Form: added "height offset" input. It can be used to change floor and ceiling height by given value. Also added some tooltips.

Map Analysis mode: fixed a couple of minor glitches related to enabling/disabling results list, "fix" buttons and "fix all" checkbox.

Updated documentation.

Map Analysis mode: results list now has a context menu, which allows to hide/show results based on type of selected result and to  copy description of selected result to clipboard.

Map Analysis mode: export to file command will now show "Save File" dialog instead of putting the file in the same folder as the map, also added some boilerplate.
Tag Explorer plugin: save to file command will now show "Save File" dialog instead of putting the file in the same folder as the map, also added some boilerplate.
Internal: reformatted GZCrash.log a bit.

Internal: more info is now displayed when a shader fails to compile.

Comments Panel: probably fixed a possible crash when UpdateList() is triggered during map unloading.

Map Options Form: example map name now uses current game's naming scheme.

Internal: optimized WAD.FindLump() and WAD.FindLumpIndex() functions. They should work ~30x faster now (although, overall performance increase because of this change is fairly noticeable).

View projection is now updated when engaging Visual mode. This means no more distorted visuals after disproportionately changing window size.

Game Configurations Form: added a help item to "Testing" tab, which displays info about command line placeholders when mouseovered.
Added some missing flags to ZDoom_DECORATE.cfg.

Linedef Edit Form, UDMF: a waring is now shown when trying to apply a non-zero action without any activation flags.
Program Configuration: selected test engine index was not saved when applying the form.
Program Configuration: selected test engine index was not pasted when pasting a game configuration or test engines.
Program Configuration: in some cases current test engine name was not saved when applying the form.
Program Configuration: fixed broken logic when trying to add a test engine with the same file name as already existing one.

Texture Browser Form: some minor logic fixes (no texture groups were selected when initial texture was empty and no texture group was stored in the program configuration).
Texture Browser Form: don't save current texture group when the form was canceled.
Keyboard Shortcut Reference export: generated html will now be saved to program configuration folder if working folder is write-protected.
Internal: added SupportedMapFormats property to EditModeAttribute. A mode with this property specified will be available only in specified map formats.
Interface: Ceiling Align Mode and Floor Align Mode are now enabled by default.
Interface: Ceiling Align Mode and Floor Align Mode are now only available in UDMF map format.
Interface: Visplane Explorer Mode is now available only in Doom map format.