[PATCH v6 0/3] MR8258: comctl32/treeview: Return from TREEVIEW_LButtonDown when the treeview handle is invalid.

[Jacob Czekalla (＠JacobCzekalla)]

comctl32/treeview: Return from TREEVIEW_LButtonDown when the treeview handle is invalid.

LButtonDown should return when the treeview handle is invalid (e.g. destroyed) after NM_CLICK to prevent further message processing.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58211

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  v6: comctl32/treeview: Return from TREEVIEW_LButtonDown when the treeview handle is invalid.
      comctl32/treeview: Add a function for sending notifications that also checks for invalid treeview.
      comctl32/tests: Add a test for treeview deletion during NM_CLICK in LBUTTONDOWN.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8258