XFCE

- window focus
  go to focus tab on window manager setting and uncheck options 'Automatically give focus to newly created windows'
  and 
  Raise window when clicking inside application window
   
  This will solve the problem of drag and drop when windows are overlapping each other
  
Xfce packages

 There are 15 members in group xfce4:
:: Repository extra
   1) exo  2) garcon  3) thunar  4) thunar-volman  5) tumbler
   6) xfce4-appfinder  7) xfce4-panel  8) xfce4-power-manager  9) xfce4-session
   10) xfce4-settings  11) xfce4-terminal  12) xfconf  13) xfdesktop  14) xfwm4
   15) xfwm4-themes

Enter a selection (default=all): 
:: There are 36 members in group xfce4-goodies:
:: Repository extra
   1) mousepad  2) parole  3) ristretto  4) thunar-archive-plugin
   5) thunar-media-tags-plugin  6) xfburn  7) xfce4-artwork
   8) xfce4-battery-plugin  9) xfce4-clipman-plugin  10) xfce4-cpufreq-plugin
   11) xfce4-cpugraph-plugin  12) xfce4-dict  13) xfce4-diskperf-plugin
   14) xfce4-eyes-plugin  15) xfce4-fsguard-plugin  16) xfce4-genmon-plugin
   17) xfce4-mailwatch-plugin  18) xfce4-mount-plugin  19) xfce4-mpc-plugin
   20) xfce4-netload-plugin  21) xfce4-notes-plugin  22) xfce4-notifyd
   23) xfce4-pulseaudio-plugin  24) xfce4-screensaver  25) xfce4-screenshooter
   26) xfce4-sensors-plugin  27) xfce4-smartbookmark-plugin
   28) xfce4-systemload-plugin  29) xfce4-taskmanager
   30) xfce4-time-out-plugin  31) xfce4-timer-plugin  32) xfce4-verve-plugin
   33) xfce4-wavelan-plugin  34) xfce4-weather-plugin
   35) xfce4-whiskermenu-plugin  36) xfce4-xkb-plugin