PopupMenu closes as soon as it appears

[Ymanawat]

Godot version

4.2 latest

System information

Godot v4.2.dev (f9004b52f) - Windows 10.0.22621 - Vulkan (Forward+)

Issue description

The popup menu closes as soon as it appears. This behavior appears to be triggered by the automatic selection of the first option in the list upon opening. It happens only when the list is large enough that requires scrolling.
here is the error I'm getting :

ERROR: Condition "index == -1" is true. Returning: Rect2i()
   at: subwindow_get_popup_safe_rect (scene\main\viewport.cpp:3513)

I want to solve this but not getting the exact problem and solution. Related to #73413 & #76480.

2023-09-04.14-36-05.mp4

Steps to reproduce

Run the attached project or

Create any OptionMenu add enough items that requires scroll.
Click on option menu and see it closes as soon as it appears.

Minimal reproduction project

optionmenu.zip

[Sauermann]

The problem, you are describing is unrelated to the subwindow_get_popup_safe_rect-error message and you will find that the error-message has been (temporarily) removed in current master in #79937, because it is currently expected to happen.

You describe the behavior that:

1. On Mouse-Button-Down the OptionMenu opens
2. On Mouse-Button-Up the item, that is under the mousecursor is selected

The fact that the Menu is opened (in some conditions) at a position, where the mousecursor is located is problematic, because a quick mouse-down + mouse-up selects the item at that location.
From a usability point of view it would be better, if the menu is opened non-overlapping with the original OptionButton.

A different approach would be to open the Menu not on Mouse-Button-Down, but on Mouse-Button-Up.

[Ymanawat]

The problem, you are describing is unrelated to the subwindow_get_popup_safe_rect-error message

I don't know it's related or not I was just getting this error only when I clicked on optionmenu and it gets closed.

the Menu is opened (in some conditions) at a position, where the mousecursor is located is problematic, because a quick mouse-down + mouse-up selects the item at that location.

I misunderstood the behaviour, because how the menu is behaving in a condition where we have fewer items feels different than when we have a large list. The response was too quick to notice.

[Sauermann]

I am going to reopen this issue, because this is an usability problem that needs to be fixed.