chatgui: invite link dialogs, zxing-cpp QR code, crypto transport, channel improvements; msg_transport: chat protocol support

tools/chatgui/src/inputbar.cpp

@@ -5,6 +5,7 @@
 #include <QTextEdit>
 #include <QPushButton>
 #include <QHBoxLayout>
+#include <QVBoxLayout>
 #include <QFileDialog>
 #include <QKeyEvent>
 #include <QFontMetrics>
@@ -23,6 +24,16 @@ static QPushButton *makeIconBtn(const QString &text, const QString &tooltip, QWi
     return btn;
 }
 
+static QWidget *wrapBottomBtn(QPushButton *btn, int pad) {
+    auto *w = new QWidget(btn->parentWidget());
+    auto *l = new QVBoxLayout(w);
+    l->setContentsMargins(0, 0, 0, 0);
+    l->setSpacing(0);
+    l->addWidget(btn);
+    l->addSpacing(pad);
+    return w;
+}
+
 InputBar::InputBar(EmojiPanel *emojiPanel, QWidget *parent)
     : QWidget(parent)
     , m_input(new QTextEdit(this))
@@ -41,7 +52,7 @@ InputBar::InputBar(EmojiPanel *emojiPanel, QWidget *parent)
             qDebug() << "Attached:" << path;
         }
     });
-    layout->addWidget(attachBtn, 0, Qt::AlignBottom);
+    layout->addWidget(wrapBottomBtn(attachBtn, 3), 0, Qt::AlignBottom);
 
     m_input->setAcceptRichText(false);
     m_input->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -58,7 +69,7 @@ InputBar::InputBar(EmojiPanel *emojiPanel, QWidget *parent)
 
     m_emojiBtn = makeIconBtn(QString::fromUtf8("\xF0\x9F\x99\x82"),
                              QString::fromUtf8("Смайлики"), this);
-    layout->addWidget(m_emojiBtn, 0, Qt::AlignBottom);
+    layout->addWidget(wrapBottomBtn(m_emojiBtn, 3), 0, Qt::AlignBottom);
 
     auto *sendBtn = makeIconBtn(QString::fromUtf8("\xE2\x9E\xA4"),
                                 QString::fromUtf8("Отправить"), this);