More robust change detection for autocomplete.

- accurately detect when labels are involved in 'remove' event

services/web/public/coffee/ide/editor/directives/aceEditor/auto-complete/AutoCompleteManager.coffee

@@ -121,27 +121,33 @@ define [
 		onChange: (change) ->
 			cursorPosition = @editor.getCursorPosition()
 			end = change.end
+			range = new Range(end.row, 0, end.row, end.column)
+			lineUpToCursor = @editor.getSession().getTextRange(range)
+			commandFragment = getLastCommandFragment(lineUpToCursor)
+
+			# Check if user has backspaced/deleted a highlighted region of text
+			# and see if that contains a `\label{}`
+			if change.action == 'remove'
+				if _.any(change.lines, (line) -> line.match(/\\label\{[^\}\n\\]{0,80}\}/))
+					@labelsManager.scheduleLoadLabelsFromOpenDoc()
+				if commandFragment? and commandFragment.length > 2
+					if commandFragment.startsWith('\\label{')
+						@labelsManager.scheduleLoadLabelsFromOpenDoc()
+
 			# Check that this change was made by us, not a collaborator
 			# (Cursor is still one place behind)
 			# NOTE: this is also the case when a user backspaces over a highlighted region
-			if end.row == cursorPosition.row and end.column == cursorPosition.column + 1
+			if (
-				if change.action == "insert"
+				change.action == "insert" and
-					range = new Range(end.row, 0, end.row, end.column)
+				end.row == cursorPosition.row and
-					lineUpToCursor = @editor.getSession().getTextRange(range)
+				end.column == cursorPosition.column + 1
-					commandFragment = getLastCommandFragment(lineUpToCursor)
+			)
-
+				if commandFragment? and commandFragment.length > 2
-					if commandFragment? and commandFragment.length > 2
+					if commandFragment.startsWith('\\label{')
-						if commandFragment.startsWith('\\label{')
-							@labelsManager.scheduleLoadLabelsFromOpenDoc()
-						setTimeout () =>
-							@editor.execCommand("startAutocomplete")
-						, 0
-			else
-				# Check if user has backspaced/deleted a highlighted region of text
-				# and see if that contains a `\label{}`
-				if change.action == 'remove'
-					if _.any(change.lines, (line) -> line.match(/\\label{.*}/))
 						@labelsManager.scheduleLoadLabelsFromOpenDoc()
+					setTimeout () =>
+						@editor.execCommand("startAutocomplete")
+					, 0
 
 		monkeyPatchAutocomplete: () ->
 			Autocomplete = ace.require("ace/autocomplete").Autocomplete