[RFC] Check to redrawcmdline after handling K_EVENT or K_COMMAND

[gelguy]

2nd attempt at #9790.

Check if cmdline needs to be drawn and redraws it accordingly.

2 cases:

1. Cmdline has been moved up due to a message - set cmdline_was_last_drawn in msg_puts_display, which both MSG and EMSG will call.
2. update_screen has been called - this clears the cmdline so it needs to be redrawn.

[justinmk]

Do you plan to add a test? If this fixes #8490 then test should be fairly easy to write.

[gelguy]

run() is not added here as adding it will cause the test to pass with or without the fix.

Without the fix, this test fails with:

Expected:
  |*                         |
  |{3:                         }|
  |:012345678901234567890123|
  |456789^                   |
  |456789^                   |
Actual:
  |*:012345678901234567890123|
  |:012345678901234567890123|
  |:012345678901234567890123|
  |:012345678901234567890123|
  |456789^                   |

The cmdline is redrawn multiple times, indicating that the test or Screen API is causing more than 1 redrawcmdline.
Adding run() seems to clear the extra cmdlines and results in the test not failing.

[bfredl]

What would be be the purpose of adding run()? Bare run() shouldn't be used in a screen test as it discards redraw events. Use timeout param to screen:expect{} if the purpose is to wait longer.

[wsdjeg]

thanks, and please remove the binary file.

[justinmk]

Rebased and fixed lint issues.

[blueyed]

@gelguy
Thanks for this!
Maybe you can help with #3757 ? (just re-tried the example from there, hoping that this PR here would fix it also, but it did not)