IDEA-88179 Allow to switch off completion item selection by typing dot, space etc.

platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupTypedHandler.java

@@ -43,6 +43,7 @@ import com.intellij.openapi.editor.ex.ScrollingModelEx;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.registry.Registry;
 import com.intellij.psi.PsiFile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -230,6 +231,9 @@ public class LookupTypedHandler extends TypedHandlerDelegate {
   }
 
   static CharFilter.Result getLookupAction(final char charTyped, final LookupImpl lookup) {
+    if (!Registry.is("ide.completion.allow.finishing.by.chars")) {
+      return CharFilter.Result.ADD_TO_PREFIX;
+    }
     final CharFilter.Result filtersDecision = getFiltersDecision(charTyped, lookup);
 
     final LookupElement currentItem = lookup.getCurrentItem();
@@ -249,7 +253,9 @@ public class LookupTypedHandler extends TypedHandlerDelegate {
       }
     }
 
-    if (filtersDecision != null) return filtersDecision;
+    if (filtersDecision != null) {
+      return filtersDecision;
+    }
     throw new AssertionError("Typed char not handler by char filter: c=" + charTyped +
                              "; prefix=" + currentItem +
                              "; filters=" + Arrays.toString(getFilters()));

platform/platform-resources-en/src/misc/registry.properties

@@ -200,6 +200,9 @@ projectView.hide.dot.idea=true
 show.live.templates.in.completion=false
 documentation.component.editor.font=false
 
+ide.completion.allow.finishing.by.chars=true
+ide.completion.allow.finishing.by.chars.description=Controls whether typing dot, space, etc. may select the current lookup item
+
 ide.completion.middle.matching=true
 # suppress inspection "UnusedProperty"
 ide.completion.middle.matching.description=Suggest items in completion that contain the entered string somewhere in the middle.