Stop color picker tooltip from stealing input events

Input events go to the tooltip because it's added to `popup_list` in
DisplayServer `popup_open`. I think there's no harm in tooltips being omitted
from the list, so this commit blocks non-popup windows from being added if they
have `FLAG_NO_FOCUS` and `FLAG_MOUSE_PASSTHROUGH`.

I'm not happy with this way of detecting tooltips. It'll also catch other
windows where this behavior may or may not be wanted.

I thought about adding `FLAG_TOOLTIP`, but went with the smaller change for
now.

Fixes #79500.

platform/linuxbsd/x11/display_server_x11.cpp

@@ -4190,8 +4190,11 @@ void DisplayServerX11::popup_open(WindowID p_window) {
 		}
 	}
 
+	// Detect tooltips and other similar popups that shouldn't block input to their parent.
+	bool ignores_input = window_get_flag(WINDOW_FLAG_NO_FOCUS, p_window) && window_get_flag(WINDOW_FLAG_MOUSE_PASSTHROUGH, p_window);
+
 	WindowData &wd = windows[p_window];
-	if (wd.is_popup || has_popup_ancestor) {
+	if (wd.is_popup || (has_popup_ancestor && !ignores_input)) {
 		// Find current popup parent, or root popup if new window is not transient.
 		List<WindowID>::Element *C = nullptr;
 		List<WindowID>::Element *E = popup_list.back();

platform/macos/display_server_macos.mm

@@ -3430,8 +3430,11 @@ void DisplayServerMacOS::popup_open(WindowID p_window) {
 		}
 	}
 
+	// Detect tooltips and other similar popups that shouldn't block input to their parent.
+	bool ignores_input = window_get_flag(WINDOW_FLAG_NO_FOCUS, p_window) && window_get_flag(WINDOW_FLAG_MOUSE_PASSTHROUGH, p_window);
+
 	WindowData &wd = windows[p_window];
-	if (wd.is_popup || has_popup_ancestor) {
+	if (wd.is_popup || (has_popup_ancestor && !ignores_input)) {
 		bool was_empty = popup_list.is_empty();
 		// Find current popup parent, or root popup if new window is not transient.
 		List<WindowID>::Element *C = nullptr;

platform/windows/display_server_windows.cpp

@@ -3574,8 +3574,11 @@ void DisplayServerWindows::popup_open(WindowID p_window) {
 		}
 	}
 
+	// Detect tooltips and other similar popups that shouldn't block input to their parent.
+	bool ignores_input = window_get_flag(WINDOW_FLAG_NO_FOCUS, p_window) && window_get_flag(WINDOW_FLAG_MOUSE_PASSTHROUGH, p_window);
+
 	WindowData &wd = windows[p_window];
-	if (wd.is_popup || has_popup_ancestor) {
+	if (wd.is_popup || (has_popup_ancestor && !ignores_input)) {
 		// Find current popup parent, or root popup if new window is not transient.
 		List<WindowID>::Element *C = nullptr;
 		List<WindowID>::Element *E = popup_list.back();