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Undo history seems to be wiped when you preview your UI ("Content") and then switch back to source.
I have tried this issue and able to reproduce this issue at my end.
Steps To Reproduce:
1. Create an Android application.
2. Open the designer file.
3. open the source file of designer.
4. Add the new button.
5. Undo option is visible under Edit menu.
6. Now switch from source to designer and select the button to undo it. Undo option is disable under Edit menu.
note: Same behavior getting while performing the same operation from designer to source level.
Ide Log: https://gist.github.com/Abhishekk360/64329dcdb9df7ceaaa42
=== Xamarin Studio ===
Version 5.10.2 (build 50)
Installation UUID: 93e693b0-b53d-40f4-b29c-b61ff5cbe892
Mono 4.2.2 (explicit/d5c4649)
GTK+ 2.24.23 (Raleigh theme)
Package version: 402020023
=== Xamarin.Profiler ===
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
=== Xamarin.Android ===
Version: 126.96.36.199 (Enterprise Edition)
Android SDK: /Users/xamarin23/Desktop/android-sdk-macosx
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
4.3 (API level 18)
4.4 (API level 19)
4.4.87 (API level 20)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.1
SDK Build Tools Version: 23.0.2
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)
=== Xamarin Android Player ===
Location: /Applications/Xamarin Android Player.app
=== Apple Developer Tools ===
Xcode 7.1 (9079)
=== Xamarin.Mac ===
Version: 188.8.131.52 (Enterprise Edition)
=== Xamarin.iOS ===
Version: 184.108.40.206 (Enterprise Edition)
Build date: 2016-01-05 20:20:30-0500
=== Build Information ===
Release ID: 510020050
Git revision: 63da12d16f2ab00849bd9dd59d08ba7f5f05d578
Build date: 2016-01-11 19:27:34-05
Xamarin addins: 55f2d3596d8c1229f68d10e2b94332ca67222b48
Build lane: monodevelop-lion-cycle6-c6sr1
=== Operating System ===
Mac OS X 10.10.5
Darwin 800BC.local 14.5.0 Darwin Kernel Version 14.5.0
Wed Jul 29 02:26:53 PDT 2015