fix: 桌面拾取下钻到包含鼠标点的最小控件，修复命中容器级大元素

resources/desktop-picker.ps1

@@ -15,6 +15,29 @@ if ($Mode -eq "windows") {
   exit 0
 }
 
+function Get-DeepestAtPoint([double]$px, [double]$py) {
+  $point = New-Object System.Windows.Automation.Point($px, $py)
+  $cur = [System.Windows.Automation.AutomationElement]::FromPoint($point)
+  if (-not $cur) { return $null }
+  for ($depth = 0; $depth -lt 30; $depth++) {
+    $children = $cur.FindAll([System.Windows.Automation.TreeScope]::Children, [System.Windows.Automation.Condition]::TrueCondition)
+    $next = $null
+    $nextArea = [double]::MaxValue
+    foreach ($c in $children) {
+      try {
+        $r = $c.Current.BoundingRectangle
+        if ($r.Width -gt 0 -and $r.Height -gt 0 -and $px -ge $r.X -and $px -le ($r.X + $r.Width) -and $py -ge $r.Y -and $py -le ($r.Y + $r.Height)) {
+          $area = $r.Width * $r.Height
+          if ($area -lt $nextArea) { $next = $c; $nextArea = $area }
+        }
+      } catch {}
+    }
+    if (-not $next) { break }
+    $cur = $next
+  }
+  return $cur
+}
+
 $form = New-Object System.Windows.Forms.Form
 $form.FormBorderStyle = [System.Windows.Forms.FormBorderStyle]::None
 $form.TopMost = $true
@@ -35,9 +58,7 @@ $result = $null
 while ($true) {
   $ptX = [System.Windows.Forms.Cursor]::Position.X
   $ptY = [System.Windows.Forms.Cursor]::Position.Y
-  $point = New-Object System.Windows.Automation.Point($ptX, $ptY)
-  $el = $null
-  try { $el = [System.Windows.Automation.AutomationElement]::FromPoint($point) } catch {}
+  $el = Get-DeepestAtPoint $ptX $ptY
   $down = ([RpaPick.PickW32]::GetAsyncKeyState(32) -band 0x8000) -ne 0
   $esc = ([RpaPick.PickW32]::GetAsyncKeyState(27) -band 0x8000) -ne 0
   if ($esc) { break }