fix(terminal): normalize padding before fit

src/renderer/src/components/terminal-pane/terminal-appearance.test.ts

@@ -378,6 +378,31 @@ describe('applyTerminalAppearance theme assignment', () => {
       expect.objectContaining({ paddingX: 4, paddingY: 4 })
     )
   })
+
+  it('rounds imported half-pixel padding before fitting', () => {
+    const pane = makePane(1)
+    const manager = makeManager([pane])
+    const settings = {
+      ...getDefaultSettings('/tmp'),
+      terminalPaddingX: 1.5,
+      terminalPaddingY: 2.5
+    }
+
+    applyTerminalAppearance(
+      manager,
+      settings,
+      true,
+      new Map(),
+      new Map(),
+      'false',
+      new Map(),
+      new Map()
+    )
+
+    expect(manager.setPaneStyleOptions).toHaveBeenCalledWith(
+      expect.objectContaining({ paddingX: 2, paddingY: 3 })
+    )
+  })
 })
 
 describe('publishTerminalViewAttributesAtAppStart', () => {

src/renderer/src/components/terminal-pane/terminal-appearance.ts

@@ -158,6 +158,9 @@ export function applyTerminalAppearance(
     settings.terminalLigatures,
     settings.terminalFontFamily
   )
+  // FitAddon parses each CSS padding as an integer, so normalize imported half-pixels before styling and fitting.
+  const paddingX = Math.round(settings.terminalPaddingX ?? 4)
+  const paddingY = Math.round(settings.terminalPaddingY ?? 4)
 
   // Why before the pane loop: FitAddon subtracts live .xterm padding, so the
   // CSS vars must be stamped before safeFit or a padding shrink leaves a stale grid.
@@ -169,8 +172,8 @@ export function applyTerminalAppearance(
     opacityTransitionMs: paneStyles.opacityTransitionMs,
     dividerThicknessPx: paneStyles.dividerThicknessPx,
     focusFollowsMouse: paneStyles.focusFollowsMouse,
-    paddingX: settings.terminalPaddingX ?? 4,
-    paddingY: settings.terminalPaddingY ?? 4
+    paddingX,
+    paddingY
   })
 
   for (const pane of manager.getPanes()) {