desktop-shell: don't resize again when mouse is in the panel

    while resizing window , if  drag it to the top, the titlebar will be covered by the panel. As a result, the window cannot move or change the size again .
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  Container Prep
passed #10016714
container_prep

00:00:36

 
  Build
passed #10016716
kvm
build-docs

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passed #10016715
kvm
build-native-meson-default-options

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passed #10016717
kvm
build-native-meson-no-gl-renderer

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  Pages
passed #10016718
docs-and-coverage

00:00:16

passed #10016719
pages

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  Deploy
passed pages:deploy

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