diff --git a/interface/wx/event.h b/interface/wx/event.h
index 1096d48f12..8744f1be34 100644
--- a/interface/wx/event.h
+++ b/interface/wx/event.h
@@ -1300,10 +1300,20 @@ enum wxKeyCategoryFlags
     /// home and end keys, on and off numeric keypads
     WXK_CATEGORY_JUMP,
 
-    /// tab key, on and off numeric keypads
+    /**
+        Tab key, on and off numeric keypads.
+
+        Note that while `Ctrl+I` and `TAB` keys generate the same key code,
+        only the latter is considered to be in this category.
+     */
     WXK_CATEGORY_TAB,
 
-    /// backspace and delete keys, on and off numeric keypads
+    /**
+        Backspace and delete keys, on and off numeric keypads.
+
+        Note that while `Ctrl+H` and `BACKSPACE` keys generate the same key
+        code, only the latter is considered to be in this category.
+     */
     WXK_CATEGORY_CUT,
 
     /// union of WXK_CATEGORY_ARROW, WXK_CATEGORY_PAGING, and WXK_CATEGORY_JUMP categories
diff --git a/samples/keyboard/keyboard.cpp b/samples/keyboard/keyboard.cpp
index 98f32da274..fdbc5eb818 100644
--- a/samples/keyboard/keyboard.cpp
+++ b/samples/keyboard/keyboard.cpp
@@ -236,8 +236,8 @@ MyFrame::MyFrame(const wxString& title)
                                             wxDefaultPosition, wxDefaultSize,
                                             wxTE_READONLY);
     headerText->SetValue(
-               " event          key     KeyCode mod   UnicodeKey  "
-               "  RawKeyCode RawKeyFlags  Position      Repeat");
+               " event            key   KeyCode mod    UnicodeKey "
+               " RawKeyCode RawKeyFlags  Position  Repeat?  Category");
 
 
     m_logText = new wxTextCtrl(this, wxID_ANY, "",
@@ -257,7 +257,7 @@ MyFrame::MyFrame(const wxString& title)
     SetSizerAndFit(sizer);
 
     // set size and position on screen
-    SetSize(700, 340);
+    SetSize(FromDIP(wxSize(700, 340)));
     CentreOnScreen();
 
     // connect menu event handlers
@@ -537,6 +537,33 @@ wxString GetKeyName(const wxKeyEvent &event)
     return "unknown";
 }
 
+// another helper showing the key category as determined by IsKeyInCategory().
+wxString GetKeyCategory(const wxKeyEvent& event)
+{
+    struct Category
+    {
+        wxKeyCategoryFlags category;
+        const char* name;
+    };
+
+    const Category categories[] =
+    {
+        { WXK_CATEGORY_ARROW,   "arrow" },
+        { WXK_CATEGORY_PAGING,  "page" },
+        { WXK_CATEGORY_JUMP,    "jump" },
+        { WXK_CATEGORY_TAB,     "tab" },
+        { WXK_CATEGORY_CUT,     "cut" },
+    };
+
+    for ( const auto& cat : categories )
+    {
+        if ( event.IsKeyInCategory(cat.category) )
+            return cat.name;
+    }
+
+    return {};
+}
+
 
 void MyFrame::LogEvent(const wxString& name, wxKeyEvent& event)
 {
@@ -551,6 +578,7 @@ void MyFrame::LogEvent(const wxString& name, wxKeyEvent& event)
 #endif
                    "  (%5d,%5d)"
                    "  %s"
+                   "     %s"
                    "\n",
                name,
                GetKeyName(event),
@@ -568,6 +596,7 @@ void MyFrame::LogEvent(const wxString& name, wxKeyEvent& event)
                , event.GetX()
                , event.GetY()
                , event.IsAutoRepeat() ? "Yes" : "No"
+               , GetKeyCategory(event)
                );
 
     m_logText->AppendText(msg);
diff --git a/src/common/event.cpp b/src/common/event.cpp
index b0a1100d3b..0ad7eaaa4d 100644
--- a/src/common/event.cpp
+++ b/src/common/event.cpp
@@ -849,10 +849,58 @@ bool wxKeyEvent::IsKeyInCategory(int category) const
             return (category & WXK_CATEGORY_JUMP) != 0;
 
         case WXK_TAB:
+            // We have to make an extra check for this one, as it's a synonym
+            // for Ctrl-I, but we don't want to recognize Ctrl-I as a TAB key.
+            // As raw key codes are platform-dependent we have to do it in
+            // platform-specific way.
+#ifdef __WXMSW__
+            // Under Windows the native WM_CHAR already does the translation
+            // and so we need to look at the scan code, which is part of the
+            // flags, rather than the key code itself.
+            if ( ((GetRawKeyFlags() >> 16) & 0xff) == 0x17 )
+            {
+                return false;
+            }
+#else // !__WXMSW__
+            // For the other platforms we can use the raw key code, but it's
+            // still different, with Mac doing its own thing. We assume all the
+            // other platforms do as GTK does and use either "I" or "i" for
+            // this letter events.
+            switch ( GetRawKeyCode() )
+            {
+#ifdef __WXOSX__
+                case 0x22: // kVK_ANSI_I
+#else
+                case 'I':
+                case 'i':
+#endif
+                    return false;
+            }
+#endif // __WXMSW__/!__WXMSW__
+            wxFALLTHROUGH;
         case WXK_NUMPAD_TAB:
             return (category & WXK_CATEGORY_TAB) != 0;
 
         case WXK_BACK:
+            // See the comment above for TAB.
+#ifdef __WXMSW__
+            if ( ((GetRawKeyFlags() >> 16) & 0xff) == 0x23 )
+            {
+                return false;
+            }
+#else // !__WXMSW__
+            switch ( GetRawKeyCode() )
+            {
+#ifdef __WXOSX__
+                case 0x04: // kVK_ANSI_H
+#else
+                case 'H':
+                case 'h':
+#endif
+                    return false;
+            }
+#endif // __WXMSW__/!__WXMSW__
+            wxFALLTHROUGH;
         case WXK_DELETE:
         case WXK_NUMPAD_DELETE:
             return (category & WXK_CATEGORY_CUT) != 0;