[vim/vim] helptoc navigation jumps incorrectly and flickers when hlsearch is active and using J/K (Issue #21051)

[VimWei]

VimWei created an issue (vim/vim#21051)

Issue Description:
When active search highlighting (hlsearch) is present in the buffer, navigating the helptoc popup menu via J / K causes screen flickering and incorrect cursor movement when changing heading depth levels.

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Steps to Reproduce:

1. Create a Markdown file (e.g., test.md) with hierarchical headers:

# level 1 a
## level 2 b
### level 3 c
### level 3 d
### level 3 e
### level 3 f

2. Open the file in GVIM and trigger search highlighting (e.g., /level and press Enter). Ensure hlsearch is active.
3. Open the table of contents popup via :HelpToc.
4. Press uppercase J or K to navigate through the popup entries.

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Observed Behavior:

1. Window Flickering: Every keypress of J or K causes the helptoc popup window to flicker/redraw.
2. First Jump Lag on Depth Change: When moving between different heading levels (e.g., from ## level 2 b down to ### level 3 c):

• 1st press of J: The cursor remains stuck at ## level 2 b.
• 2nd press of J: The cursor finally jumps to ### level 3 c.

3. Unexpected Cursor Retreat: Continuing to press J to move from ### level 3 c down to ### level 3 d causes the window to flicker and the cursor to incorrectly jump back up to ## level 2 b.

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Expected Behavior:
helptoc navigation using J / K should smoothly move between heading items regardless of active search highlighting (hlsearch), without screen flickering or incorrect level jumps.

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Environment:

• OS: Windows 10
• Vim Version: gVim 9.2.0907 x64 (signed)
• Terminal/GUI: gVim (GUI)

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