Keep Slice and Print Visible When Plugin Page Tabs Overflow (#16541)

src/slic3r/GUI/MainFrame.cpp

@@ -1739,6 +1739,9 @@ void MainFrame::fit_tab_labels()
     for (size_t i = count - 1; i >= 1; --i) {
         int right = ScreenToClient(m_slice_option_btn->ClientToScreen({})).x;
         int left  = sizer->GetSize().GetWidth();
+        // The overflow button sits between the tab buttons and the side tools, so it is not free space.
+        if (const wxWindow* overflow = ctrl->GetOverflowButton())
+            left += overflow->GetSize().GetWidth();
         if (right - left - FromDIP(15) > 0) return;
         ctrl->SetCompact(i, true);
         m_tabpanel->Refresh();

src/slic3r/GUI/Notebook.hpp

@@ -57,6 +57,7 @@ public:
     // ORCA: a companion widget shown right after the tab buttons (before any side_tools), e.g.
     // an overflow indicator. Pass nullptr to remove it; ownership stays with the caller.
     void SetOverflowButton(wxWindow* button);
+    wxWindow* GetOverflowButton() const { return m_overflow_button; }
 
 private:
     wxFlexGridSizer*                m_buttons_sizer;

src/slic3r/plugin/host/PluginPages.cpp

@@ -4,6 +4,7 @@
 #include "slic3r/GUI/GUI.hpp"
 #include "slic3r/GUI/Notebook.hpp"
 #include "slic3r/GUI/GUI_App.hpp"
+#include "slic3r/GUI/MainFrame.hpp"
 #include "slic3r/GUI/Widgets/Button.hpp"
 #include "slic3r/GUI/wxExtensions.hpp"
 #include "slic3r/plugin/PluginManager.hpp"
@@ -382,6 +383,7 @@ void PluginPages::relayout()
             m_parent->SelectPageByName(id_to_reselect);
     }
 
+    const bool overflow_changed = need_overflow != (m_overflow_button != nullptr);
     if (need_overflow) {
         if (m_overflow_button == nullptr) {
             auto* btn = new Button(m_parent->GetBtnsListCtrl(), wxString(L"\u25BE"), wxString(), wxNO_BORDER);
@@ -398,6 +400,11 @@ void PluginPages::relayout()
         m_overflow_button->Destroy();
         m_overflow_button = nullptr;
     }
+
+    // The tab strip changed width; compact the labels again so the side tools stay visible.
+    if ((!up_to_date || overflow_changed) && !GUI::wxGetApp().is_closing())
+        if (GUI::MainFrame* mainframe = GUI::wxGetApp().mainframe)
+            mainframe->fit_tab_labels();
 }
 
 void PluginPages::select_page(const PluginCapabilityId& id)