message: fix(graphql-playground-react): prevent selection of text
  prevent selection of text when one did mouseup outside button or execute box
diff: @@ -220,6 +220,7 @@ const Button = styled<ButtonProps, 'div'>('div')`
  : p.theme.editorColours.executeButton};
  border: 6px solid ${p => p.theme.editorColours.executeButtonBorder};
  cursor: pointer;
  + user-select: none;
  svg {
  fill: ${p => (p.theme.mode === 'light' ? 'white' : 'inherit')};
  @@ -242,6 +243,7 @@ const ExecuteBox = styled.div`
  position: absolute;
  top: 78px;
  z-index: 100;
  + user-select: none;
  &:before {
  position: absolute;
  