Fix Ctrl+Shift+Z redo shortcut (#5258)

This shortcut was previously triggering the Undo action due to the
matches_logically method ignoring the state of the Shift key. This was
solved by simply inverting the order of the undo and redo arms, so the
undo is not matched if the shortcut corresponds to redo.

* Closes <https://github.com/emilk/egui/issues/5255>
* [x] I have followed the instructions in the PR template

crates/egui/src/widgets/text_edit/builder.rs

@@ -978,23 +978,7 @@ fn events(
                     break;
                 }
             }
-            Event::Key {
-                key: Key::Z,
-                pressed: true,
-                modifiers,
-                ..
-            } if modifiers.matches_logically(Modifiers::COMMAND) => {
-                if let Some((undo_ccursor_range, undo_txt)) = state
-                    .undoer
-                    .lock()
-                    .undo(&(cursor_range.as_ccursor_range(), text.as_str().to_owned()))
-                {
-                    text.replace_with(undo_txt);
-                    Some(*undo_ccursor_range)
-                } else {
-                    None
-                }
-            }
+
             Event::Key {
                 key,
                 pressed: true,
@@ -1016,6 +1000,24 @@ fn events(
                 }
             }
 
+            Event::Key {
+                key: Key::Z,
+                pressed: true,
+                modifiers,
+                ..
+            } if modifiers.matches_logically(Modifiers::COMMAND) => {
+                if let Some((undo_ccursor_range, undo_txt)) = state
+                    .undoer
+                    .lock()
+                    .undo(&(cursor_range.as_ccursor_range(), text.as_str().to_owned()))
+                {
+                    text.replace_with(undo_txt);
+                    Some(*undo_ccursor_range)
+                } else {
+                    None
+                }
+            }
+
             Event::Key {
                 modifiers,
                 key,