The "Open an existing Android Studio project" button on the welcome screen deletes all the IDE settings, customizations, scratches, changesets, etc in the project. I would not expect opening a project to be destructive without confirmation. Ie I expect it not to delete my precious data.

Note that choosing to open the project by choosing it from the recent projects list on the welcome screen works as expected (ie stuff is not deleted). I would expect the Open button to work like this.

Repro steps showing shelved changes go missing, but all other settings also go missing:
- New project wizard, create blank activity
- In the MainActivity file, make some changes - eg delete the onCreate method (exact changes don't matter)
- In "Version control" tool window, right click MainActivity and choose "Shelve changes" and confirm.
- Note that this shows another tab "Shelf" in the tool window, which contains 1 file, with the changes just made
- File > Close Project; welcome screen should now be shown

Path 1 (recent project):
- Click on the project at the top of the list on the left-side of recent projects on the welcome screen
- Note it opens and 1 file is still in the shelf (Desired behavior)
- File > Close Project; welcome screen should now be shown again

Path 2 (open existing):
- Click "Open an existing Android Studio Project" on the welcome screen
- Navigate file chooser to select directory containing the project created above (note that the directory has an Android Studio icon instead of a folder, denoting it's already an Studio project)
- Note that add file to VCS dialog appears (why does opening an existing project add a file?)
- Note that Version Control tool window > Shelf is empty (the changes shelved above have been deleted without warning)

I would expect Path 2 to result in the same effects as Path 1. Further, if opening the project needs to be destructive, I would expect some sort of confirmation prompt before deleting user files in the project.

Build: 3.3 Canary 13, AI-182.4505.22.33.5035453, 201809272200, AI-182.4505.22.33.5035453, JRE 1.8.0_152-release-1248-b01x64 JetBrains s.r.o, OS Linux(amd64) v4.18.9-arch1-1-ARCH unknown, screens 1600x900
Android Gradle Plugin: 3.3.0-alpha13
Gradle: 4.10.2
NDK: from local.properties: 18.0.5002713; latest from SDK: 18.0.5002713; LLDB: pinned revision 3.1 not found; latest from SDK: (package not found); CMake: from local.properties: (not specified); latest from SDK: (not found); from PATH: 3.12.2; IMPORTANT: Please read https://developer.android.com/studio/report-bugs.html carefully and supply all required information.

Issue 117745801

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