Vacuum: deselect what is blown out, Ctrl + wheel scrolls the bag, Ctrl+click fix (t20)

Blowing out the last of a selected material removes it from the selection,
so an emptied selection picks up what you click again. Ctrl + wheel never
zooms the page and scrolls the bag list under the mouse. A bag click while
Ctrl is held adds to the selection even if the click lacks the Ctrl flag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/selection.js

@@ -217,10 +217,11 @@ function renderBag() {
     const row = el('div', { class: 'bagrow' + (bag[m] > 0 ? '' : ' none') + (sel ? ' on' : '') });
     const b = el('button', { class: 'pick', title: 'Select ' + MD[m].name });
     b.innerHTML = `<span class="sw" style="background:${rgbOf(m)}"></span><span class="nm">${esc(MD[m].name)}</span><span class="n num">${bag[m] > 0 ? bag[m].toLocaleString('en-US') : '–'}</span>`;
-    // Ctrl+click adds to or removes from the selection.
+    // Ctrl+click adds to or removes from the selection. GAME.ctrl too: on some Linux setups the click
+    // arrives without ctrlKey even though the Ctrl keydown (which opened the full list) was seen.
     b.oncontextmenu = e => e.preventDefault();
     b.onclick = e => {
-      if (e.ctrlKey || e.metaKey) { toggleBlow(m); if (t !== 'vacuum') selectTool(1); return; }
+      if (e.ctrlKey || e.metaKey || GAME.ctrl) { toggleBlow(m); if (t !== 'vacuum') selectTool(1); return; }
       if (t === 'build' && piece().filter && filterable(m)) { toggleFilterMat(m); return; }
       else if (t === 'build' && WALL_OF[m]) { GAME.wallMat = m; if (!pieceUsesWall(piece())) GAME.pieceIdx = 0; }
       else { GAME.blow = GAME.blow.size === 1 && GAME.blow.has(m) ? new Set() : new Set([m]); if (t !== 'vacuum') selectTool(1); }