[stepping on the pit] MELD in win11 wsl2 cannot be used normally. Problem repair

Win11 Has been used by default in wslg To display WSL2 Medium GUI, No additional opening is required Xserver, This is really a very convenient and practical function , But at the moment, （2021.12） It doesn't seem particularly perfect yet . In the process of experience, I encountered a problem of egg pain ：meld Exception occurred while comparing files .

meld Is an open source file for comparison / Folder tools , similar Beyond Compare. It can be set to git merge.tool, So as to solve git Conflict during merge . Before Win10+WSL2+Xserver Use... In the environment meld I haven't had any problems , But in Win11 But it will report a lot of mistakes ：

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 34, in do_realize
    self._handle1.realize(self)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 270, in realize
    attr.cursor = Gdk.Cursor.new_for_display(widget.get_display(),
TypeError: constructor returned NULL
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 46, in do_map
    self._handle1.set_visible(True)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 288, in set_visible
    self._window.show()
AttributeError: 'NoneType' object has no attribute 'show'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 201, in do_size_allocate
    self._handle1.set_visible(mapped and wlink1 > 0)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 288, in set_visible
    self._window.show()
AttributeError: 'NoneType' object has no attribute 'show'
...

I haven't found a solution to this problem on the internet yet , Looks like GTK The problem of , The closest post is ：TypeError constructor returned NULL in wayland session. It happened that wslg Also used wayland, With a try mentality , I opened the /usr/lib/python3/dist-packages/meld/diffgrid.py, Place the third of them 270 Change line to ：

#attr.cursor = Gdk.Cursor.new_for_display(widget.get_display(),
# Gdk.CursorType.
# SB_H_DOUBLE_ARROW)
attr.cursor = Gdk.Cursor.new_from_name(widget.get_display(), "col-resize")

The test again , Everything is all right ~~