Only drag with primary pointer button

Author: mankinskin

egui/src/containers/window.rs

@@ -522,6 +522,10 @@ fn interact(
 
 fn move_and_resize_window(ctx: &Context, window_interaction: &WindowInteraction) -> Option<Rect> {
     window_interaction.set_cursor(ctx);
+    // only use primary clicks as window interaction
+    if !ctx.input().pointer.button_down(PointerButton::Primary) {
+        return None;
+    }
     let pointer_pos = ctx.input().pointer.interact_pos()?;
     let mut rect = window_interaction.start_rect; // prevent drift
 
@@ -575,7 +579,7 @@ fn window_interaction(
     if window_interaction.is_none() {
         if let Some(hover_window_interaction) = resize_hover(ctx, possible, area_layer_id, rect) {
             hover_window_interaction.set_cursor(ctx);
-            if ctx.input().pointer.any_pressed() && ctx.input().pointer.any_down() {
+            if ctx.input().pointer.any_pressed() && ctx.input().pointer.button_down(PointerButton::Primary) {
                 ctx.memory().interaction.drag_id = Some(id);
                 ctx.memory().interaction.drag_is_window = true;
                 window_interaction = Some(hover_window_interaction);

egui/src/context.rs

@@ -248,7 +248,7 @@ impl CtxRef {
                             // the slider will steal the drag away from the window.
                             // This is needed because we do window interaction first (to prevent frame delay),
                             // and then do content layout.
-                            if sense.drag
+                            if sense.drag && self.input().pointer.button_down(PointerButton::Primary)
                                 && (memory.interaction.drag_id.is_none()
                                     || memory.interaction.drag_is_window)
                             {