When titlebar is hidden and with padding, dragging the title bar scrolls the terminal

[bric3]

Describe the bug
A clear and concise description of what the bug is. I believe the mouse events should not trigger when in the padding area.

To Reproduce
Steps to reproduce the behavior:

1. set hide_window_decorations titlebar-only
2. set window_padding_width 28 5 5
3. have a long enough scrollback history (like multiple ls -la)
4. use the mouse to drag the terminal from the titlebar "placeholder"
5. Notice scrolling is initiated.

Screenshots

Screen.Recording.2023-03-29.at.12.49.31.mov

Environment details

        color214                           #fabd2f   
        color223                           #ebdbb2   
        color228                           #f2e5bc   
        color229                           #fbf1c7   
        color230                           #f9f5d7   
        color234                           #1d2021   
        color235                           #282828   
        color236                           #32302f   
        color237                           #3c3836   
        color239                           #504945   
        color24                            #076678   
        color241                           #665c54   
        color243                           #7c6f64   
        color244                           #928374   
        color245                           #928374   
        color246                           #a89984   
        color248                           #bdae93   
        color250                           #d5c4a1   
        color3                             #d79921   
        color4                             #458588   
        color5                             #b16286   
        color6                             #689d6a   
        color66                            #427b58   
        color7                             #a89984   
        color8                             #928374   
        color88                            #9d0006   
        color9                             #fb4934   
        color96                            #8f3f71   
        cursor                             #ebdbb2   
        foreground                         #ebdbb2   

Important environment variables seen by the kitty process:
        PATH                                /Applications/kitty.app/Contents/MacOS:/usr/bin:/bin:/usr/sbin:/sbin
        LANG                                en_US.UTF-8
        SHELL                               /bin/zsh
        USER                                brice.dutheil

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[kovidgoyal]

dup of #3744