Fix Try Dart handling of Backspace that joins lines

tests/try/firefox-linemerges.applescript

Index: tests/try/firefox-linemerges.applescript
diff --git a/tests/try/firefox-linemerges.applescript b/tests/try/firefox-linemerges.applescript
new file mode 100644
index 0000000000000000000000000000000000000000..c62c9c6a5256c2f412d5fa11afc5c8d3e16eefc0
--- /dev/null
+++ b/tests/try/firefox-linemerges.applescript
@@ -0,0 +1,98 @@
+-- Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+-- for details. All rights reserved. Use of this source code is governed by a
+-- BSD-style license that can be found in the LICENSE file.
+
+-- This: 'tell application "Firefox" to activate' doesn't seem to bring
+-- application in focus if it's not already open.
+do shell script "open -a Firefox"
+
+delay 3.0
+
+tell application "System Events"
+	--- Open Incognito window to avoid effect of caching of pages.
+	keystroke "p" using {command down, shift down}
+	
+	delay 1.0
+	
+	keystroke "l" using command down
+	
+	keystroke "http://localhost:8080/"
+	-- Simulate Enter key.
+	key code 36
+	
+	delay 10.0
+	
+	-- Refresh the page to reload the scripts
+	keystroke "r" using command down
+	
+	keystroke "l" using command down
+	
+	delay 1.0
+	
+	-- Simulate Tab key to get to 'Pick an example' dropdown
+	repeat 8 times

[ahe, 2014/09/05 13:10:44]

Fancy stuff :-)

+		key code 48
+	end repeat
+	
+	-- Simulate Down then Enter to select Hello, World
+	key code 125
+	key code 36
+	
+	delay 1.0
+	
+	keystroke "l" using command down
+	
+	delay 1.0
+	
+	-- Simulate Tab key to get to Code editor.
+	repeat 9 times
+		key code 48
+	end repeat
+	
+	-- Simulate sequence of Down keys to get to "print(greeting);" line
+	repeat 8 times
+		key code 125
+	end repeat
+	
+	-- Simulate Cmd-Right.
+	key code 124 using command down
+	
+	keystroke "print('c');"
+	
+	-- Simulate Left*11 to get to the beginning of "print('c');"
+	repeat 11 times
+		key code 123
+	end repeat
+	
+	-- Simulate Enter to split lines
+	key code 36
+	
+	-- Simulate Delete to join lines
+	key code 51
+	
+	-- Simulate Enter to split lines
+	key code 36
+	
+	-- Simulate Right*8 to get to right after the c in "print('c');"
+	repeat 8 times
+		key code 124
+	end repeat
+	
+	keystroke "d"
+	
+	delay 0.1
+	keystroke "a" using command down
+	delay 0.2
+	keystroke "c" using command down
+	
+	delay 1
+	set clipboardData to (the clipboard as text)
+	
+	if ("print('cd')" is not in (clipboardData as string)) then
+		error "print('cd')  is not in clipboardData: "
+	end if
+end tell
+
+tell application "Firefox" to quit
+
+display notification "Test passed" with title "Firefox test" sound name "Glass"