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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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