Improve band combo box pop up list width management

CMakeLists.txt

@@ -238,6 +238,7 @@ set (wsjt_qt_CXXSRCS
   Network/NetworkAccessManager.cpp
   widgets/LazyFillComboBox.cpp
   widgets/CheckableItemComboBox.cpp
+  widgets/BandComboBox.cpp
   )
 
 set (wsjt_qtmm_CXXSRCS

map65/mainwindow.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>635</width>
-    <height>512</height>
+    <height>523</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -1704,7 +1704,7 @@ p, li { white-space: pre-wrap; }
   <customwidget>
    <class>DisplayText</class>
    <extends>QTextBrowser</extends>
-   <header>displaytext.h</header>
+   <header>widgets/displaytext.h</header>
   </customwidget>
  </customwidgets>
  <resources/>

widgets/BandComboBox.cpp

@@ -0,0 +1,27 @@
+#include "BandComboBox.hpp"
+
+#include <QAbstractItemView>
+#include <QScrollBar>
+#include <QDebug>
+#include "models/FrequencyList.hpp"
+
+BandComboBox::BandComboBox (QWidget * parent)
+  : QComboBox {parent}
+{
+}
+
+// Fix up broken QComboBox item view rendering which doesn't allow for
+// a vertical scroll bar in width calculations and ends up eliding the
+// item text.
+void BandComboBox::showPopup ()
+{
+  auto minimum_width = view ()->sizeHintForColumn (FrequencyList_v2::frequency_mhz_column);
+  if (count () > maxVisibleItems ())
+    {
+      // for some as yet unknown reason, in FT8 mode the scrollbar
+      // width is oversize on the first call here
+      minimum_width += view ()->verticalScrollBar ()->width ();
+    }
+  view ()->setMinimumWidth (minimum_width);
+  QComboBox::showPopup ();
+}

widgets/BandComboBox.hpp

@@ -0,0 +1,16 @@
+#ifndef BAND_COMBO_BOX_HPP__
+#define BAND_COMBO_BOX_HPP__
+
+#include <QComboBox>
+
+class BandComboBox
+  : public QComboBox
+{
+public:
+  explicit BandComboBox (QWidget * = nullptr);
+
+private:
+  void showPopup () override;
+};
+
+#endif

widgets/mainwindow.ui

@@ -644,7 +644,7 @@ QPushButton[state="ok"] {
           </widget>
          </item>
          <item row="0" column="0">
-          <widget class="QComboBox" name="bandComboBox">
+          <widget class="BandComboBox" name="bandComboBox">
            <property name="toolTip">
             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Select operating band or enter frequency in MHz or enter kHz increment followed by k.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
            </property>
@@ -661,7 +661,7 @@ QPushButton[state=&quot;ok&quot;] {
             <enum>QComboBox::NoInsert</enum>
            </property>
            <property name="sizeAdjustPolicy">
-            <enum>QComboBox::AdjustToMinimumContentsLength</enum>
+            <enum>QComboBox::AdjustToMinimumContentsLengthWithIcon</enum>
            </property>
           </widget>
          </item>
@@ -3434,7 +3434,7 @@ Double-click to reset to the standard 73 message</string>
  <customwidgets>
   <customwidget>
    <class>DisplayText</class>
-   <extends>QTextEdit</extends>
+   <extends>QTextBrowser</extends>
    <header>widgets/displaytext.h</header>
   </customwidget>
   <customwidget>
@@ -3468,6 +3468,11 @@ Double-click to reset to the standard 73 message</string>
    <extends>QPushButton</extends>
    <header>widgets/DoubleClickablePushButton.hpp</header>
   </customwidget>
+  <customwidget>
+   <class>BandComboBox</class>
+   <extends>QComboBox</extends>
+   <header>widgets/BandComboBox.hpp</header>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>decodedTextBrowser</tabstop>