Prevent creation of new branches by validating branch selection

Author: elchananarb

checkmarx-ast-eclipse-plugin/src/com/checkmarx/eclipse/views/CheckmarxView.java

@@ -869,38 +869,58 @@ public void selectionChanged(SelectionChangedEvent event) {
 				if (selection.size() > 0) {
 					String selectedBranch = ((String) selection.getFirstElement());
 
+					// Check if selected branch exists in currentBranches
+					if (!currentBranches.contains(selectedBranch)) {
+						// Invalid branch - reset to default text and disable scan button
+						PluginUtils.setTextForComboViewer(branchComboViewer, BRANCH_COMBO_VIEWER_TEXT);
+						updateStartScanButton(false);
+						return;
+					}
+
 					// Avoid non-sense trigger changed when opening the combo
 					if (selectedBranch.equals(currentBranch) && !scansCleanedByProject) {
 						CxLogger.info(PluginConstants.INFO_CHANGE_BRANCH_EVENT_NOT_TRIGGERED);
-
 						return;
 					}
 
 					onBranchChangePluginLoading(selectedBranch);
 
 					List<Scan> scanList = DataProvider.getInstance().getScansForProject(selectedBranch);
-					if(!scanList.isEmpty()) {
+					if (!scanList.isEmpty()) {
 						latestScanId = getLatestScanFromScanList(scanList).getId();
 					}
-					scanIdComboViewer.setInput(scanList);							
+					scanIdComboViewer.setInput(scanList);
 					loadLatestScanByDefault(scanList);
-					
+
 					sync.asyncExec(new Runnable() {
 						public void run() {
 							PluginUtils.enableComboViewer(projectComboViewer, true);
 							PluginUtils.enableComboViewer(scanIdComboViewer, true);
 							PluginUtils.updateFiltersEnabledAndCheckedState(toolBarActions.getFilterActions());
 							toolBarActions.getStateFilterAction().setEnabled(true);
 							updateStartScanButton(true);
-						}	
+						}
 					});
-					
+
 					PluginUtils.updateFiltersEnabledAndCheckedState(toolBarActions.getFilterActions());
 				}
 			}
 		});
+
+		// Add ModifyListener to handle manual text input
+		branchComboViewer.getCombo().addModifyListener(e -> {
+			String enteredBranch = branchComboViewer.getCombo().getText();
+
+			// If text was modified and branch doesn't exist
+			if (!currentBranches.contains(enteredBranch)) {
+				updateStartScanButton(false); // Disable scan button
+			} else {
+				updateStartScanButton(true); // Enable scan button if branch is valid
+			}
+		});
 	}
-	
+
+
 	private void loadLatestScanByDefault(List<Scan> scanList) {
 		if(scanList.isEmpty()) {
 			PluginUtils.setTextForComboViewer(scanIdComboViewer, PluginConstants.COMBOBOX_SCAND_ID_NO_SCANS_AVAILABLE);