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bug#30582: Line number shifts left when horizontal scrolling with a tab.


From: Keith David Bershatsky
Subject: bug#30582: Line number shifts left when horizontal scrolling with a tab.
Date: Thu, 22 Feb 2018 12:51:29 -0800

Step 1:  Launch Emacs 26

Step 2:  Switch to the *scratch* buffer.  We should be on line 4, with the 
default scratch message on the first 2 lines above.

Step 3:  M-x display-line-numbers-mode

Step 4:  Type:  C-q TAB Hello-world.

Step 5:  Evaluate:  (scroll-left 5)

Observe that the line number of the current line shifts to the left such that 
it is no longer aligned with the other line numbers.  The same will hold true 
under a variety of similar circumstances; e.g., line numbers exist below the 
current line; more than 10 lines exist, etc.

Related issue:  I am still working on debugging a few semi-related issues 
involving move_it_in_display_line_to in conjunction with bug #30226, and I see 
the need to either fix the problem described above; or, create a programmatic 
workaround when calculating X and HPOS along on the current line whenever line 
numbers shift to the left.  If the problem described above is fixed, then no 
programmatic workaround would be needed.

Thanks,

Keith





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