Fix focus behavior when pressing Tab with no focus (#1861)

CHANGELOG.md

@@ -31,6 +31,7 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui-w
 * Fixed `Plot` auto-bounds bug ([#1599](https://github.com/emilk/egui/pull/1599)).
 * Fixed dead-lock when alt-tabbing while also showing a tooltip ([#1618](https://github.com/emilk/egui/pull/1618)).
 * Fixed `ScrollArea` scrolling when editing an unrelated `TextEdit` ([#1779](https://github.com/emilk/egui/pull/1779)).
+* Fixed focus behavior when pressing Tab in a UI with no focused widget ([#1861](https://github.com/emilk/egui/pull/1861)).
 
 
 ## 0.18.1 - 2022-05-01

egui/src/memory.rs

@@ -298,6 +298,7 @@ impl Focus {
         } else if self.pressed_tab && self.id == None && !self.give_to_next {
             // nothing has focus and the user pressed tab - give focus to the first widgets that wants it:
             self.id = Some(id);
+            self.pressed_tab = false;
         }
 
         self.last_interested = Some(id);