fix(tui): skip Termux height redraws closes #2467

packages/tui/src/tui.ts

@@ -107,6 +107,10 @@ function parseSizeValue(value: SizeValue | undefined, referenceSize: number): nu
 	return undefined;
 }
 
+function isTermuxSession(): boolean {
+	return Boolean(process.env.TERMUX_VERSION);
+}
+
 /**
  * Options for overlay positioning and sizing.
  * Values can be absolute numbers or percentage strings (e.g., "50%").
@@ -937,9 +941,18 @@ export class TUI extends Container {
 			return;
 		}
 
-		// Width or height changed - full re-render
-		if (widthChanged || heightChanged) {
-			logRedraw(`terminal size changed (${this.previousWidth}x${this.previousHeight} -> ${width}x${height})`);
+		// Width changes always need a full re-render because wrapping changes.
+		if (widthChanged) {
+			logRedraw(`terminal width changed (${this.previousWidth} -> ${width})`);
+			fullRender(true);
+			return;
+		}
+
+		// Height changes normally need a full re-render to keep the visible viewport aligned,
+		// but Termux changes height when the software keyboard shows or hides.
+		// In that environment, a full redraw causes the entire history to replay on every toggle.
+		if (heightChanged && !isTermuxSession()) {
+			logRedraw(`terminal height changed (${this.previousHeight} -> ${height})`);
 			fullRender(true);
 			return;
 		}