Tests that setting selector text can be undone.

=== Before selector modification ===
[expanded] 
element.style  { ()

[expanded] 
#inspected  { (undo-set-selector-text.html:4 -> undo-set-selector-text.html:4:1)
color: green;

[expanded] 
div  { (user agent stylesheet)
display: block;


=== After selector modification ===
[expanded] 
element.style  { ()

[expanded] 
#inspected, #other  { (undo-set-selector-text.html:4 -> undo-set-selector-text.html:4:13)
color: green;

[expanded] 
div  { (user agent stylesheet)
display: block;


=== After undo ===
[expanded] 
element.style  { ()

[expanded] 
#inspected  { (undo-set-selector-text.html:4 -> undo-set-selector-text.html:4:1)
color: green;

[expanded] 
div  { (user agent stylesheet)
display: block;


=== After redo ===
[expanded] 
element.style  { ()

[expanded] 
#inspected, #other  { (undo-set-selector-text.html:4 -> undo-set-selector-text.html:4:13)
color: green;

[expanded] 
div  { (user agent stylesheet)
display: block;