Oh, thanks for tackling this issue, I will certainly try, when time permits...

I'm getting a warning when compiling, that is new I think:

Compiling drivers/X11/Fl_X11_Screen_Driver.cxx...
drivers/X11/Fl_X11_Screen_Driver.cxx: In member function ‘virtual Fl_RGB_Image* Fl_X11_Screen_Driver::read_win_rectangle(int, int, int, int, Fl_Window*, bool, bool*)’:
drivers/X11/Fl_X11_Screen_Driver.cxx:726:9: warning: ‘sy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  726 |     off = a - b;
      |     ~~~~^~~~~~~
drivers/X11/Fl_X11_Screen_Driver.cxx:789:21: note: ‘sy’ was declared here
  789 |     int dx, dy, sx, sy, sw, sh;
      |                     ^~

Certainly it stems from line 821, where sy is passed as first parameter to fl_subimage_offsets But why does it not warn for sx in the line before? Maybe a compiler glitch?

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