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fix(grid): stop FitAddon double-counting pane padding (clipped last row)

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The focused grid cell's last terminal row was clipped by the cell border/focus
ring at large/maximized window sizes. Root cause (measured in headless Chromium):
.term-pane is box-sizing:border-box, so getComputedStyle(pane).height — which
xterm's FitAddon reads to compute rows — returns the padding-box height and
double-counts the pane's own padding, packing one extra row that overruns the
border (overflow +6px). Fix: box-sizing:content-box on the grid pane so the height
reports the content box; FitAddon drops the phantom row and the 6px bottom padding
becomes real clearance. Verified overflow +6 → −10px (16px clear) at grid-4/grid-6,
1920×1200 (DPR 1 & 2), unchanged at 1200×800. Single mode untouched.
This commit is contained in:
Yaojia Wang
2026-07-12 06:00:26 +02:00
parent c6d819f85f
commit f8f82dce21
1 changed files with 12 additions and 0 deletions
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12
public/style.css
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@@ -357,6 +357,18 @@ body {
border-radius: var(--radius);
background: var(--bg);
}
/* Keep the last terminal row clear of the cell border/focus ring in a grid.
* Root cause (measured): the base .term-pane is box-sizing:border-box, so
* getComputedStyle(pane).height — which xterm's FitAddon reads to compute rows —
* returns the PADDING-box height and double-counts the pane's own padding, packing
* one extra row that overruns into the border (overflow +6px). content-box makes
* that height report the CONTENT box, so FitAddon drops the phantom row and the 6px
* padding becomes real clearance. (Single mode keeps padding 0 so the terminal
* still fills to the key-bar.) */
#term.grid .term-pane {
box-sizing: content-box;
padding-bottom: 6px;
}
/* Maximized quadrant fills the whole grid as an ABSOLUTE overlay (taken out of
* grid flow so the siblings keep their placement — spanning grid tracks instead
* would shove auto-placed siblings into implicit rows, resizing their live PTYs).