Show and hide the buttons icons

When the GNOME staff has decided to hide the menu icons they also removed the stock icons in the buttons, uniforming the user interface and making it a bit smaller.

The good news is that is still possible to enable and show the buttons icons again. The above image shows the GNOME Screenshot dialog with the buttons icons enabled.

To show again the buttons icons you could execute the following command in a terminal window:

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The modal windows behavior

A modal dialog is a window which, once opened, will not allow the user any interaction with the window below until the dialog is closed.

In GNOME 3 the default modal dialog behavior is to attach the window so both the back and front window will be firmly attached together and dragging one of them will move even the other window, like if they became a single window.