How can I turn off alt-right mouse button function in 12.10?

By default the alt + mouse combination activates the window menu.

The activate the window menu shortcut is currently set to alt+space

The Alt-RMB key combo is used in blender for selecting edge loops.

3 Answers

Install the compizconfig-settings-manager package and run ccsm. At General | General Options | Key bindings | Window Menu click on Alt<Button3>, de-select Enabled and click OK.

P.S. If this doesn't work, assign a different key to Window Menu. Thanks to Morichalion.

Fix Alt-drag window move:

With Unity-2D (and now Gnome 3), this is controlled using the/apps/metacity/general/mouse_button_modifier GConf key. To disable Alt+Click dragging, run:

gconftool-2 --set /apps/metacity/general/mouse_button_modifier --type string '<Super>'

To re-enable it, run:

gconftool-2 --set /apps/metacity/general/mouse_button_modifier --type string '<Alt>'

Note that this GConf key controls several mouse shortcuts:

• Alt+Click: Move windows

• Alt+Middle Click: Resize windows

• Alt+Right Click: Open a generic window menu

Alt-drag fix for gnome 3:
Here is the new fix:

sudo gconftool-2 --set /org/gnome/desktop/wm/preferences/mouse-button-modifier --type string '<Super>'

If that doesn't work, try this:

1. install dconf-tools:

   sudo apt-get install dconf-tools

2. Then run:

   dconf-editor

3. Then navigate to:

   org → gnome → desktop → wm → preferences → mouse-button-modifier

4. Change the value to:

   <Super>

5. Close the dconf-editor window.

Why this should be necessary when there's a dialogue for system hotkeys under keyboard preferences, is beyond me. Very frustrating having to hunt it down with each new release/update of gnome!

Source: How do I disable window move with alt + left mouse button in GNOME Shell?

Try Shift + Alt + RMB. That was the best solution I could find. You can customize your keys in Blender's user preferences to change loop selection to something else too.