[lang] SelectWordHandler: prefer element on the left if we are at the end of existing selection

Fixes IDEA-339055 `Extend selection` doesn't select qualifier of string templates properly

GitOrigin-RevId: 5008dfa9a1f448feda4c588362bde4e16fe6a810

java/java-frontback-tests/testSrc/com/intellij/codeInsight/AbstractBasicJavaSelectWordTest.java

@@ -210,6 +210,7 @@ public abstract class AbstractBasicJavaSelectWordTest extends SelectWordTestBase
   public void testStringTemplate4() { doTest("java"); }
   public void testStringTemplate5() { doTest("java"); }
   public void testStringTemplate6() { doTest("java"); }
+  public void testStringTemplate7() { doTest("java"); }
 
   public void testLineComments() { doTest("java"); }
 

java/java-tests/testData/codeInsight/selectWordAction/stringTemplate7/after1.java

@@ -0,0 +1,8 @@
+class Test {
+  void test() {
+    int i = 1;
+    String sql = <selection>STR."""
+                select * from customer \{i}
+                """<caret></selection>;
+  }
+}

java/java-tests/testData/codeInsight/selectWordAction/stringTemplate7/before.java

@@ -0,0 +1,8 @@
+class Test {
+  void test() {
+    int i = 1;
+    String sql = STR.<selection>"""
+                select * from customer \{i}
+                """<caret></selection>;
+  }
+}

platform/lang-impl/src/com/intellij/codeInsight/editorActions/SelectWordHandler.java

@@ -205,6 +205,9 @@ public final class SelectWordHandler extends EditorActionHandler.ForEachCaret {
     if ((caretOffset == text.length() || Character.isWhitespace(text.charAt(caretOffset))) && !Character.isWhitespace(prev)) {
       return caretOffset - 1;
     }
+    if (caret.getSelectionEnd() == caretOffset && caret.getSelectionStart() < caretOffset) {
+      return caretOffset - 1;
+    }
     return caretOffset;
   }