diff --git a/plugins/maven/src/test/BUILD.bazel b/plugins/maven/src/test/BUILD.bazel
index 0af1114faea9..686471775d15 100644
--- a/plugins/maven/src/test/BUILD.bazel
+++ b/plugins/maven/src/test/BUILD.bazel
@@ -15,7 +15,6 @@ jvm_library(
         # do not sort,
         "//platform/vcs-api:vcs",
         "//platform/util/progress",
-        "//plugins/repository-search/common",
     ],
 )
 
@@ -178,6 +177,8 @@ jvm_library(
         "//platform/execution:execution_test_lib",
         "//plugins/repository-search/common",
         "//plugins/repository-search/common:common_test_lib",
+        "//plugins/repository-search/completion",
+        "//plugins/repository-search/completion:completion_test_lib",
         "//plugins/maven/completion",
         "//plugins/maven/completion:completion_test_lib",
         "//plugins/maven/jps/ide",
diff --git a/plugins/maven/src/test/intellij.maven.tests.iml b/plugins/maven/src/test/intellij.maven.tests.iml
index e5d8c2e2669a..3ff2567688dd 100644
--- a/plugins/maven/src/test/intellij.maven.tests.iml
+++ b/plugins/maven/src/test/intellij.maven.tests.iml
@@ -75,7 +75,8 @@
     <orderEntry type="module" module-name="intellij.xml.psi.impl" scope="TEST" />
     <orderEntry type="module" module-name="intellij.xml.ui.common" scope="TEST" />
     <orderEntry type="module" module-name="intellij.platform.execution" scope="TEST" />
-    <orderEntry type="module" module-name="intellij.repository.search.common" />
+    <orderEntry type="module" module-name="intellij.repository.search.common" scope="TEST" />
+    <orderEntry type="module" module-name="intellij.repository.search.completion" scope="TEST" />
     <orderEntry type="module" module-name="intellij.maven.completion" scope="TEST" />
     <orderEntry type="module" module-name="intellij.maven.jps.ide" scope="TEST" />
     <orderEntry type="module" module-name="intellij.xml.analysis.impl" scope="TEST" />
diff --git a/plugins/maven/src/test/java/org/jetbrains/idea/maven/dom/MavenDependencyCompletionCharFilterTest.kt b/plugins/maven/src/test/java/org/jetbrains/idea/maven/dom/MavenDependencyCompletionCharFilterTest.kt
new file mode 100644
index 000000000000..e7110430d318
--- /dev/null
+++ b/plugins/maven/src/test/java/org/jetbrains/idea/maven/dom/MavenDependencyCompletionCharFilterTest.kt
@@ -0,0 +1,172 @@
+// Copyright 2000-2026 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package org.jetbrains.idea.maven.dom
+
+import com.intellij.codeInsight.completion.CompletionType
+import com.intellij.codeInsight.lookup.LookupManager
+import com.intellij.codeInsight.lookup.impl.LookupImpl
+import com.intellij.maven.testFramework.fixtures.MavenDomTestFixture
+import com.intellij.maven.testFramework.fixtures.configTest
+import com.intellij.maven.testFramework.fixtures.mavenDomFixture
+import com.intellij.maven.testFramework.fixtures.updateProjectPom
+import com.intellij.openapi.Disposable
+import com.intellij.openapi.application.EDT
+import com.intellij.repository.search.completion.api.DependencyArtifactCompletionRequest
+import com.intellij.repository.search.completion.api.DependencyCompletionContributionSource.SERVER
+import com.intellij.repository.search.completion.api.DependencyCompletionEvent
+import com.intellij.repository.search.completion.api.DependencyCompletionRequest
+import com.intellij.repository.search.completion.api.DependencyCompletionResult
+import com.intellij.repository.search.completion.api.DependencyCompletionService
+import com.intellij.repository.search.completion.api.DependencyGroupCompletionRequest
+import com.intellij.repository.search.completion.api.DependencyPartCompletionResult
+import com.intellij.repository.search.completion.api.DependencyVersionCompletionRequest
+import com.intellij.testFramework.junit5.TestApplication
+import com.intellij.testFramework.junit5.TestDisposable
+import com.intellij.testFramework.replaceService
+import com.intellij.util.application
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
+import org.intellij.lang.annotations.Language
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.ValueSource
+
+/**
+ * IDEA-392103: typing a character that occurs inside a dependency coordinate must not finish the lookup and truncate
+ * the already typed text. See [com.intellij.maven.completion.MavenCompletionCharFilter].
+ */
+@TestApplication
+class MavenDependencyCompletionCharFilterTest {
+
+  private val maven by mavenDomFixture(initialPom = MavenDomTestFixture.DEFAULT_POM)
+
+  @TestDisposable
+  private lateinit var disposable: Disposable
+
+  private val testCompletionService = object : DependencyCompletionService {
+    override fun suggestCompletions(request: DependencyCompletionRequest): Flow<DependencyCompletionEvent<DependencyCompletionResult>> =
+      flowOf(DependencyCompletionEvent.Item(DependencyCompletionResult("org.springframework", "spring-core", "6.2.0", source = SERVER)))
+
+    override fun suggestGroupCompletions(request: DependencyGroupCompletionRequest): Flow<DependencyCompletionEvent<DependencyPartCompletionResult>> =
+      flowOf(DependencyCompletionEvent.Item(DependencyPartCompletionResult("org.springframework", SERVER)))
+
+    override fun suggestArtifactCompletions(request: DependencyArtifactCompletionRequest): Flow<DependencyCompletionEvent<DependencyPartCompletionResult>> =
+      flowOf(DependencyCompletionEvent.Item(DependencyPartCompletionResult("spring-core.suffix", SERVER)))
+
+    override fun suggestVersionCompletions(request: DependencyVersionCompletionRequest): Flow<DependencyCompletionEvent<DependencyPartCompletionResult>> =
+      flowOf(DependencyCompletionEvent.Item(DependencyPartCompletionResult("6.2.0", SERVER)))
+  }
+
+  @BeforeEach
+  fun replaceCompletionService() {
+    application.replaceService(DependencyCompletionService::class.java, testCompletionService, disposable)
+  }
+
+  @ParameterizedTest
+  @ValueSource(chars = ['-', ':', '.', '_'])
+  fun `test typing special char in top level does not truncate typed text`(charToType: Char) = runBlocking {
+    completeAndType("""
+      <dependencies>
+        org.springframework<caret>
+      </dependencies>
+      """, charToType)
+
+    assertTrue(documentText.contains("org.springframework$charToType"),
+               "The typed text must be preserved and extended, but was:\n$documentText")
+    assertNotNull(activeLookup, "'$charToType' must be added to the prefix, so the lookup must stay open")
+  }
+
+  @ParameterizedTest
+  @ValueSource(chars = ['-', ':', '.', '_'])
+  fun `test typing special char in dependency tag does not truncate typed text`(charToType: Char) = runBlocking {
+    completeAndType("""
+      <dependencies>
+        <dependency>org.springframework<caret></dependency>
+      </dependencies>
+      """, charToType)
+
+    assertTrue(documentText.contains("<dependency>org.springframework$charToType</dependency>"),
+               "The typed text must be preserved and extended, but was:\n$documentText")
+    assertNotNull(activeLookup, "'$charToType' must be added to the prefix, so the lookup must stay open")
+  }
+
+  @ParameterizedTest
+  @ValueSource(chars = ['-', '.', '_'])
+  fun `test typing special char in group id tag does not truncate typed text`(charToType: Char) = runBlocking {
+    completeAndType("""
+      <dependencies>
+        <dependency>
+          <groupId>org.springframework<caret></groupId>
+        </dependency>
+      </dependencies>
+      """, charToType)
+
+    assertTrue(documentText.contains("<groupId>org.springframework$charToType</groupId>"),
+               "The typed text must be preserved and extended, but was:\n$documentText")
+    assertNotNull(activeLookup, "'$charToType' must be added to the prefix, so the lookup must stay open")
+  }
+
+  @ParameterizedTest
+  @ValueSource(chars = ['-', '.', '_'])
+  fun `test typing special char in artifact id tag does not truncate typed text`(charToType: Char) = runBlocking {
+    completeAndType("""
+      <dependencies>
+        <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-core<caret></artifactId>
+        </dependency>
+      </dependencies>
+      """, charToType)
+
+    assertTrue(documentText.contains("<artifactId>spring-core$charToType</artifactId>"),
+               "The typed text must be preserved and extended, but was:\n$documentText")
+    assertNotNull(activeLookup, "'$charToType' must be added to the prefix, so the lookup must stay open")
+  }
+
+  @Test
+  fun `test typing dot in version tag keeps platform behaviour`() = runBlocking {
+    completeAndType("""
+      <dependencies>
+        <dependency>
+          <groupId>org.springframework</groupId>
+          <artifactId>spring-core</artifactId>
+          <version>6.<caret></version>
+        </dependency>
+      </dependencies>
+      """, '.')
+
+    assertTrue(documentText.contains("<version>6.2.</version>"),
+               "The version lookup must keep completing till the typed char occurrence, but was:\n$documentText")
+  }
+
+  private suspend fun completeAndType(
+    @Language(value = "XML", prefix = "<project>", suffix = "</project>") dependencies: String,
+    c: Char,
+  ) {
+    maven.updateProjectPom("""
+      <groupId>test</groupId>
+      <artifactId>project</artifactId>
+      <version>1</version>
+      ${dependencies.trimIndent()}
+      """.trimIndent())
+    maven.configTest(maven.projectPom)
+    withContext(Dispatchers.EDT) {
+      val lookupElements = maven.fixture.complete(CompletionType.BASIC)
+      assertTrue(!lookupElements.isNullOrEmpty(), "The fake completion service must have produced lookup elements")
+      assertEquals(true, (activeLookup as? LookupImpl)?.isFocused, "An explicitly invoked lookup must be focused")
+      maven.fixture.type(c)
+    }
+  }
+
+  private val activeLookup
+    get() = LookupManager.getActiveLookup(maven.fixture.editor)
+
+  private val documentText
+    get() = maven.fixture.editor.document.text
+}