Directory search: don't let the platform keyboard cover our own (#275)

The directory-search widget draws its own on-screen keyboard, on by default, sized
and themed to the panel. On Android it was never visible: the page autofocuses a
real <input>, which is the signal to raise the system IME, and that lands over the
bottom of the screen — exactly where our keyboard is.

So a directory panel showed Google's keyboard instead of the one the widget ships:
split across a 1920x1080 screen, with mic, GIF, emoji, clipboard and a settings key
that opens Google's own UI on a kiosk. On the panel that turned this up, the system
keyboard WAS voice input — the only enabled IME was Google's voice IME, so touching
the search box opened a microphone, on a wall-mounted tenant directory.

When we draw a keyboard, the input now carries inputmode="none", so the platform
leaves its keyboard down. The buttons write input.value directly, so nothing about
typing changes. Browsers that don't know inputmode ignore it, which is the right
fallback — a desktop preview behaves exactly as before.

Gated on the flag, not applied to the markup: with show_onscreen_keyboard off there
is nothing to cover, and the platform keyboard is the only way left to type.

Verified by removing the line and watching the new guard fail. 1669/1669 pass.

server/routes/widgets.js

@@ -1206,6 +1206,14 @@ function renderDirectorySearch(c) {
 
   // ----- on-screen keyboard (drives the same filter path as typing) -----
   if (cfg.show_onscreen_keyboard) {
+    /* Tell the platform not to raise ITS keyboard for this field. We autofocus a real
+       <input>, which on Android is the signal to throw the system IME over the bottom of
+       the screen - directly on top of the keyboard we draw below, so a directory panel
+       showed Google's keyboard (mic, GIF and emoji keys included) and never showed its
+       own. The buttons write input.value directly, so suppressing the platform keyboard
+       costs nothing here. Ignored by browsers that don't know inputmode, which is the
+       right fallback: a desktop preview keeps behaving exactly as before. */
+    input.setAttribute('inputmode', 'none');
     var kb = document.getElementById('keyboard');
     function press(ch) { input.value += ch; try { input.focus(); } catch(e){} onInput(); }
     ['1234567890','qwertyuiop','asdfghjkl','zxcvbnm'].forEach(function(r){

server/test/directory-search.test.js

@@ -59,6 +59,24 @@ test('show_onscreen_keyboard flag is carried into the page config', async () =>
   assert.ok(html.includes('"show_onscreen_keyboard":false'), 'keyboard flag inlined (page hides the keyboard when false)');
 });
 
+test('the built-in keyboard suppresses the platform one', async () => {
+  // The page autofocuses a real <input>, which on Android raises the system IME over the
+  // bottom of the screen - covering the keyboard this widget draws itself. A panel showed
+  // Gboard, complete with a mic key, and never showed its own keyboard.
+  seed('search_kb_on', 'directory-search', { source_widget_id: 'board1', show_onscreen_keyboard: true });
+  const { html } = await fetchRender('search_kb_on');
+  assert.ok(/setAttribute\(\s*'inputmode'\s*,\s*'none'\s*\)/.test(html),
+    'page tells the platform not to raise its own keyboard');
+
+  // Only when we are drawing one. With the built-in keyboard off there is nothing to cover,
+  // and the platform keyboard is the only way left to type.
+  seed('search_kb_off2', 'directory-search', { source_widget_id: 'board1', show_onscreen_keyboard: false });
+  const off = await fetchRender('search_kb_off2');
+  assert.ok(off.html.includes('"show_onscreen_keyboard":false'), 'flag inlined as false');
+  assert.ok(!/inputmode="none"/.test(off.html),
+    'the input is not statically marked inputmode=none - suppression is gated on the flag at runtime');
+});
+
 test('missing source -> friendly fallback page, not a 500', async () => {
   seed('search_missing', 'directory-search', { source_widget_id: 'does-not-exist' });
   const { status, html } = await fetchRender('search_missing');