Reserve bottom space for fullscreen terminal

webssh/static/css/app.css

@@ -11,6 +11,7 @@
   --danger: #d65a4a;
   --danger-soft: #fff1ee;
   --shadow: 0 18px 48px rgba(21, 58, 58, 0.09);
+  --terminal-safe-bottom: 52px;
 }
 
 * {
@@ -281,6 +282,11 @@ input[type="file"].form-control {
   min-height: 0;
 }
 
+#terminal .xterm.fullscreen {
+  padding-bottom: var(--terminal-safe-bottom);
+  background: #0f1720;
+}
+
 #waiter {
   position: fixed;
   inset: 0;

webssh/static/js/main.js

@@ -300,6 +300,14 @@ jQuery(function($){
     term.fitAddon.fit();
   }
 
+  function terminal_safe_bottom() {
+    var value = window.getComputedStyle(document.documentElement)
+                    .getPropertyValue('--terminal-safe-bottom'),
+        parsed = window.parseInt(value, 10);
+
+    return parsed > 0 ? parsed : 0;
+  }
+
 
   function current_geometry(term) {
     if (!style.width || !style.height) {
@@ -310,8 +318,9 @@ jQuery(function($){
       }
     }
 
-    var cols = parseInt(window.innerWidth / style.width, 10) - 1;
-    var rows = parseInt(window.innerHeight / style.height, 10);
+    var height = window.innerHeight - terminal_safe_bottom(),
+        cols = Math.max(2, parseInt(window.innerWidth / style.width, 10) - 1),
+        rows = Math.max(1, parseInt(height / style.height, 10));
     return {'cols': cols, 'rows': rows};
   }