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.
f8f82dce21
