When you release the button the window is moved. A wire frame shows the window as it is resized. When you release the button the window is sized accordingly. Mouse Buttons on the Icons Icons are windows that have been minimized as a little window. The usual operation with an icon is to turn it back into the original window.
Icons are windows too, all windowing operations apply as well.
In most text windows you can cut out text, move to another window, and then paste the text back in. Nevertheless, we document the operation here. The cut operation, which selects text for pasting, is simple but has several variations. Each variation has its virtues, you should try all three. The highlighted result is the cut text.