Merge pull request #27738 from mantidproject/27731_disable_polt_options_for_single_bin

Disable the plotting context menu options if a matrix ws has 1 bin

qt/applications/workbench/workbench/plugins/workspacewidget.py

@@ -203,13 +203,17 @@ class WorkspaceWidget(PluginWidget):
         CreateDetectorTable(InputWorkspace=ws)
 
     def _action_double_click_workspace(self, name):
+        ws = self._ads.retrieve(name)
         try:
             # if this is a table workspace (or peaks workspace),
             # then it can't be plotted automatically, so the data is shown instead
-            TableWorkspaceDisplay.supports(self._ads.retrieve(name))
+            TableWorkspaceDisplay.supports(ws)
             self._do_show_data([name])
         except ValueError:
-            plot_from_names([name], errors=False, overplot=False, show_colorfill_btn=True)
+            if ws.blocksize() > 1:
+                plot_from_names([name], errors=False, overplot=False, show_colorfill_btn=True)
+            else:
+                self._do_show_data([name])
 
     def refresh_workspaces(self):
         self.workspacewidget.refreshWorkspaces()

qt/widgets/common/src/WorkspacePresenter/WorkspaceTreeWidgetSimple.cpp

@@ -107,6 +107,25 @@ void WorkspaceTreeWidgetSimple::popupContextMenu() {
       plotSubMenu->addAction(m_overplotSpectrum);
       plotSubMenu->addAction(m_plotSpectrumWithErrs);
       plotSubMenu->addAction(m_overplotSpectrumWithErrs);
+
+      // Don't plot 1D spectra if only one X value
+      bool multipleBins = false;
+      try {
+        multipleBins = (matrixWS->blocksize() > 1);
+      } catch (...) {
+        const size_t numHist = matrixWS->getNumberHistograms();
+        for (size_t i = 0; i < numHist; ++i) {
+          if (matrixWS->y(i).size() > 1) {
+            multipleBins = true;
+            break;
+          }
+        }
+      }
+      // disable the actions created so far if only one bin
+      for (auto action : plotSubMenu->actions()) {
+        action->setEnabled(multipleBins);
+      }
+
       plotSubMenu->addSeparator();
       plotSubMenu->addAction(m_plotColorfill);
       menu->addMenu(plotSubMenu);