diff --git a/headers/os/app/AppDefs.h b/headers/os/app/AppDefs.h
index 3cc349bd8f..77383ef39a 100644
--- a/headers/os/app/AppDefs.h
+++ b/headers/os/app/AppDefs.h
@@ -29,40 +29,40 @@ enum {
 	B_ABOUT_REQUESTED			= '_ABR',
 	B_WINDOW_ACTIVATED			= '_ACT',
 	B_APP_ACTIVATED				= '_ACT',	// Same as B_WINDOW_ACTIVATED
-	B_ARGV_RECEIVED 			= '_ARG',
-	B_QUIT_REQUESTED 			= '_QRQ',
-	B_CLOSE_REQUESTED 			= '_QRQ',	// Obsolete; use B_QUIT_REQUESTED
+	B_ARGV_RECEIVED				= '_ARG',
+	B_QUIT_REQUESTED			= '_QRQ',
+	B_CLOSE_REQUESTED			= '_QRQ',	// Obsolete; use B_QUIT_REQUESTED
 	B_CANCEL					= '_CNC',
 	B_INVALIDATE				= '_IVL',
-	B_KEY_DOWN 					= '_KYD',
-	B_KEY_UP 					= '_KYU',
-	B_UNMAPPED_KEY_DOWN 		= '_UKD',
-	B_UNMAPPED_KEY_UP 			= '_UKU',
+	B_KEY_DOWN					= '_KYD',
+	B_KEY_UP					= '_KYU',
+	B_UNMAPPED_KEY_DOWN			= '_UKD',
+	B_UNMAPPED_KEY_UP			= '_UKU',
 	B_LAYOUT_WINDOW				= '_LAY',
 	B_MODIFIERS_CHANGED			= '_MCH',
 	B_MINIMIZE					= '_WMN',
-	B_MOUSE_DOWN 				= '_MDN',
-	B_MOUSE_MOVED 				= '_MMV',
+	B_MOUSE_DOWN				= '_MDN',
+	B_MOUSE_MOVED				= '_MMV',
 	B_MOUSE_ENTER_EXIT			= '_MEX',
 	B_MOUSE_IDLE				= '_MSI',
-	B_MOUSE_UP 					= '_MUP',
+	B_MOUSE_UP					= '_MUP',
 	B_MOUSE_WHEEL_CHANGED		= '_MWC',
 	B_OPEN_IN_WORKSPACE			= '_OWS',
 	B_PACKAGE_UPDATE			= '_PKU',
 	B_PRINTER_CHANGED			= '_PCH',
-	B_PULSE 					= '_PUL',
-	B_READY_TO_RUN 				= '_RTR',
-	B_REFS_RECEIVED 			= '_RRC',
+	B_PULSE						= '_PUL',
+	B_READY_TO_RUN				= '_RTR',
+	B_REFS_RECEIVED				= '_RRC',
 	B_RELEASE_OVERLAY_LOCK		= '_ROV',
 	B_ACQUIRE_OVERLAY_LOCK		= '_AOV',
-	B_SCREEN_CHANGED 			= '_SCH',
-	B_VALUE_CHANGED 			= '_VCH',
+	B_SCREEN_CHANGED			= '_SCH',
+	B_VALUE_CHANGED				= '_VCH',
 	B_TRANSLATOR_ADDED			= '_ART',
 	B_TRANSLATOR_REMOVED		= '_RRT',
-	B_VIEW_MOVED 				= '_VMV',
-	B_VIEW_RESIZED 				= '_VRS',
-	B_WINDOW_MOVED 				= '_WMV',
-	B_WINDOW_RESIZED 			= '_WRS',
+	B_VIEW_MOVED				= '_VMV',
+	B_VIEW_RESIZED				= '_VRS',
+	B_WINDOW_MOVED				= '_WMV',
+	B_WINDOW_RESIZED			= '_WRS',
 	B_WORKSPACES_CHANGED		= '_WCG',
 	B_WORKSPACE_ACTIVATED		= '_WAC',
 	B_ZOOM						= '_WZM',
@@ -72,17 +72,17 @@ enum {
 		// Currently internal-use only. Later, public as B_FONTS_UPDATED
 	_APP_MENU_					= '_AMN',
 	_BROWSER_MENUS_				= '_BRM',
-	_MENU_EVENT_ 				= '_MEV',
+	_MENU_EVENT_				= '_MEV',
 	_PING_						= '_PBL',
-	_QUIT_ 						= '_QIT',
-	_VOLUME_MOUNTED_ 			= '_NVL',
+	_QUIT_						= '_QIT',
+	_VOLUME_MOUNTED_			= '_NVL',
 	_VOLUME_UNMOUNTED_			= '_VRM',
-	_MESSAGE_DROPPED_ 			= '_MDP',
-	_DISPOSE_DRAG_ 				= '_DPD',
+	_MESSAGE_DROPPED_			= '_MDP',
+	_DISPOSE_DRAG_				= '_DPD',
 	_MENUS_DONE_				= '_MND',
 	_SHOW_DRAG_HANDLES_			= '_SDH',
-	_EVENTS_PENDING_ 			= '_EVP',
-	_UPDATE_ 					= '_UPD',
+	_EVENTS_PENDING_			= '_EVP',
+	_UPDATE_					= '_UPD',
 	_UPDATE_IF_NEEDED_			= '_UPN',
 	_PRINTER_INFO_				= '_PIN',
 	_SETUP_PRINTER_				= '_SUP',
@@ -102,14 +102,14 @@ enum {
 	B_GET_SUPPORTED_SUITES		= 'SUIT',
 	B_UNDO						= 'UNDO',
 	B_REDO						= 'REDO',
-	B_CUT 						= 'CCUT',
-	B_COPY 						= 'COPY',
-	B_PASTE 					= 'PSTE',
+	B_CUT						= 'CCUT',
+	B_COPY						= 'COPY',
+	B_PASTE						= 'PSTE',
 	B_SELECT_ALL				= 'SALL',
-	B_SAVE_REQUESTED 			= 'SAVE',
+	B_SAVE_REQUESTED			= 'SAVE',
 	B_MESSAGE_NOT_UNDERSTOOD	= 'MNOT',
-	B_NO_REPLY 					= 'NONE',
-	B_REPLY 					= 'RPLY',
+	B_NO_REPLY					= 'NONE',
+	B_REPLY						= 'RPLY',
 	B_SIMPLE_DATA				= 'DATA',
 	B_MIME_DATA					= 'MIME',
 	B_ARCHIVED_OBJECT			= 'ARCV',
@@ -127,7 +127,7 @@ enum {
 	B_WINDOW_MOVE_TO			= 'WDMT',
 	B_WINDOW_MOVE_BY			= 'WDMB',
 	B_SILENT_RELAUNCH			= 'AREL',
-	B_OBSERVER_NOTICE_CHANGE 	= 'NTCH',
+	B_OBSERVER_NOTICE_CHANGE	= 'NTCH',
 	B_CONTROL_INVOKED			= 'CIVK',
 	B_CONTROL_MODIFIED			= 'CMOD'