UI style improvements with improved keyboard (#2710)

* fix spaces and make spacebar dynamically sized

* some spaces and a comment

* more spaces

* const

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: 3e466aa528

selfdrive/ui/qt/widgets/keyboard.cc

@@ -7,6 +7,9 @@
 
 #include "keyboard.hpp"
 
+const int DEFAULT_WIDTH = 1;
+const int SPACEBAR_WIDTH = 3;
+
 KeyboardLayout::KeyboardLayout(QWidget *parent, std::vector<QVector<QString>> layout) : QWidget(parent) {
   QVBoxLayout* vlayout = new QVBoxLayout;
   QButtonGroup* btn_group = new QButtonGroup(this);
@@ -24,14 +27,14 @@ KeyboardLayout::KeyboardLayout(QWidget* parent, std::vector<QVector<QString>> la
     for (QString p : s) {
       QPushButton* btn = new QPushButton(p);
       btn->setFixedHeight(120);
-
+      btn_group->addButton(btn);
+      hlayout->addSpacing(10);
       if (p == QString("  ")) {
-        btn->setFixedWidth(1024);
+        hlayout->addWidget(btn, SPACEBAR_WIDTH);
+      } else {
+        hlayout->addWidget(btn, DEFAULT_WIDTH);
       }
 
-      btn_group->addButton(btn);
-      hlayout->addSpacing(10);
-      hlayout->addWidget(btn);
     }
 
     if (i == 1) {