For the builds with a label assigned (no commit after the label),

show just the label in the application title. For Win32, add the
" 32 bit" indicator, so that we may see clearly if somebody is running
a 32bit build on 64bit windows by a mistake.

src/slic3r/GUI/MainFrame.cpp

@@ -145,8 +145,6 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
     update_ui_from_settings();    // FIXME (?)
 }
 
-MainFrame::~MainFrame() = default;
-
 void MainFrame::update_title()
 {
     wxString title = wxEmptyString;
@@ -158,7 +156,22 @@ void MainFrame::update_title()
         if (!project.empty())
             title += (project + " - ");
     }
-    title += (wxString(SLIC3R_BUILD_ID) + " " + _(L("based on Slic3r")));
+
+    std::string build_id = SLIC3R_BUILD_ID;
+    size_t 		idx_plus = build_id.find('+');
+    if (idx_plus != build_id.npos) {
+    	// Parse what is behind the '+'. If there is a number, then it is a build number after the label, and full build ID is shown.
+    	int commit_after_label;
+    	if (! boost::starts_with(build_id.data() + idx_plus + 1, "UNKNOWN") && sscanf(build_id.data() + idx_plus + 1, "%d-", &commit_after_label) == 0) {
+    		// It is a release build.
+    		build_id.erase(build_id.begin() + idx_plus, build_id.end());    		
+#if defined(_WIN32) && ! defined(_WIN64)
+    		// People are using 32bit slicer on a 64bit machine by mistake. Make it explicit.
+    		build_id += " 32 bit"
+#endif
+    	}
+    }
+    title += (wxString(build_id) + " " + _(L("based on Slic3r")));
 
     SetTitle(title);
 }

src/slic3r/GUI/MainFrame.hpp

@@ -96,7 +96,7 @@ protected:
 
 public:
     MainFrame();
-    ~MainFrame();
+    ~MainFrame() = default;
 
     Plater*     plater() { return m_plater; }