In dedicated widgets yes, but widgets that aren't specifically dedicated for text editing don't usually let you select the text. Try selecting explanatory text

In dedicated widgets yes, but widgets that aren't specifically dedicated for text editing don't usually let you select the text. Try selecting explanatory text, or text associated to checkboxes in a Qt app: it won't work. There are exceptions, for example you can select text in the right side file metadata pane in the Dolphin file manager. But even this is limited: you cannot cross cells. Should you copy-paste all the metadata, you'd need to do it cell by cell.