linux: Fix cursor-related panic on Wayland (#29060)

Oleksiy Syvokon created 8 months ago

This fixes the panic that happened in debug builds in Wayland when
focusing/defocusing window in the edit mode:

```
"Thread "main" panicked with "CursorStyle::None should be handled separately in the client" at crates/gpui/src/platform/linux/wayland.rs:40:17"
```

Full log:
[stacktrace.txt](https://github.com/user-attachments/files/19814411/stacktrace.txt)

@smitbarmase, you seem to have worked on this code. Tagging you for
visibility :)

Release Notes:

- N/A

Change summary

crates/gpui/src/platform/linux/wayland/client.rs | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

Detailed changes

crates/gpui/src/platform/linux/wayland/client.rs

@@ -1498,7 +1498,13 @@ impl Dispatch<wl_pointer::WlPointer, ()> for WaylandClientStatePtr {
                         state.enter_token = None;
                     }
                     if let Some(style) = state.cursor_style {
-                        if let Some(cursor_shape_device) = &state.cursor_shape_device {
+                        if let CursorStyle::None = style {
+                            let wl_pointer = state
+                                .wl_pointer
+                                .clone()
+                                .expect("window is focused by pointer");
+                            wl_pointer.set_cursor(serial, None, 0, 0);
+                        } else if let Some(cursor_shape_device) = &state.cursor_shape_device {
                             cursor_shape_device.set_shape(serial, style.to_shape());
                         } else {
                             let scale = window.primary_output_scale();