Alt-key misbehaving oddly in windows App-VMs with Photoshop

[tonsimple]

Qubes OS version (e.g., R3.2):

Qubes 3.2

Affected TemplateVMs (e.g., fedora-23, if applicable):

Windows 7 HVMs and Windows 7 template-based App-VMs

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Expected behavior:

Alt key with clone tool in photoshop to work the way it works in "native" windows

Actual behavior:

Alt key is de-facto ignored. Shape of cursor changes, but layer is not "sampled" when left-click occurs with Alt being held down.
Thus clone tool in photoshop doesn't work.

it is as if alt was intercepted

Steps to reproduce the behavior:

Have a windows 7 VM
Install photoshop (any would do, I am still on CS 2)

Try using clone tool

General notes:

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Related issues:

[marmarta]

It's a problem with XFCE (or other Linux window managers that use ALT as the 'move window' key) and any program that wants to use ALT+mouse; the best way to fix it without breaking things is changing window manager settings - in System Tools -> Window Manager Tweaks -> Accessibility you can choose which key will be used to grab and move windows, with 'Alt' being the default. It can be set to various other keys or 'None'.
I don't think we should change the default setting, though - I'd guess most people expect a Linux window manager to use 'Alt' to grab windows.

[marmarta]

It's a problem with XFCE (or other Linux window managers that use ALT as the 'move window' key) and any program that wants to use ALT+mouse; the best way to fix it without breaking things is changing window manager settings - in System Tools -> Window Manager Tweaks -> Accessibility you can choose which key will be used to grab and move windows, with 'Alt' being the default. It can be set to various other keys or 'None'.
I don't think we should change the default setting, though - I'd guess most people expect a Linux window manager to use 'Alt' to grab windows.