Fix text input on Android (#5759)

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This fixes an issue on android where keyboard input is not registered in
text boxes because `winit` does not fill in the `text` field of the
`KeyEvent`

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

crates/egui-winit/src/lib.rs

@@ -729,7 +729,7 @@ impl State {
             // When telling users "Press Ctrl-F to find", this is where we should
             // look for the "F" key, because they may have a dvorak layout on
             // a qwerty keyboard, and so the logical "F" character may not be located on the physical `KeyCode::KeyF` position.
-            logical_key,
+            logical_key: winit_logical_key,
 
             text,
 
@@ -748,7 +748,7 @@ impl State {
             None
         };
 
-        let logical_key = key_from_winit_key(logical_key);
+        let logical_key = key_from_winit_key(winit_logical_key);
 
         // Helpful logging to enable when adding new key support
         log::trace!(
@@ -791,7 +791,11 @@ impl State {
             });
         }
 
-        if let Some(text) = &text {
+        if let Some(text) = text
+            .as_ref()
+            .map(|t| t.as_str())
+            .or_else(|| winit_logical_key.to_text())
+        {
             // Make sure there is text, and that it is not control characters
             // (e.g. delete is sent as "\u{f728}" on macOS).
             if !text.is_empty() && text.chars().all(is_printable_char) {
@@ -805,7 +809,7 @@ impl State {
                 if pressed && !is_cmd {
                     self.egui_input
                         .events
-                        .push(egui::Event::Text(text.to_string()));
+                        .push(egui::Event::Text(text.to_owned()));
                 }
             }
         }