mc hangs copy-pasting vertical block (Alt+F5)

[skvadrik]

Steps to reproduce:
1) open file "mc_hangs_on_copy_paste_vertical_block" on F4 (for editing)
2) move cursor to position (row:0, column:0)
3) press Alt
4) using right and down arrows, select vertical block (width: 4 columns, height: 2 rows)
5) relese Alt
6) move cursor to position (row:4, column:0)
7) press F5

Result: mc is not responding to any keybord signals.
Expected result: selected block copy-pasted successfully.

Note: file contains long ASCII lines (it's a part of source code).

[skvadrik]

file contains long ASCII lines

[andrew_b]

Actually, mc doesn't hang. It performs a very long-time operation.