Improvements in KotlinCopyPasteReferenceProcessor

reduced scope of nonBlockingRead to avoid long rerun of it
used smart pointers to keep valid elements over changes
moved back to non-modal progress

Relates to #KT-37414

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ApplicationUtils.kt

@@ -43,4 +43,10 @@ fun <T> Project.executeCommand(name: String, groupId: Any? = null, command: () -
     return result as T
 }
 
-fun <T> runWithCancellationCheck(block: () -> T): T = block()
+fun <T> runWithCancellationCheck(block: () -> T): T = block()
+
+inline fun invokeLater(crossinline action: () -> Unit) {
+    ApplicationManager.getApplication().invokeLater { action() }
+}
+
+inline fun isUnitTestMode(): Boolean = ApplicationManager.getApplication().isUnitTestMode

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ApplicationUtils.kt.192

@@ -46,4 +46,10 @@ fun <T> Project.executeCommand(name: String, groupId: Any? = null, command: () -
     return result as T
 }
 
-fun <T> runWithCancellationCheck(block: () -> T): T = block()
+fun <T> runWithCancellationCheck(block: () -> T): T = block()
+
+inline fun invokeLater(crossinline action: () -> Unit) {
+    ApplicationManager.getApplication().invokeLater { action() }
+}
+
+inline fun isUnitTestMode(): Boolean = ApplicationManager.getApplication().isUnitTestMode

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ApplicationUtils.kt.201

@@ -44,4 +44,10 @@ fun <T> Project.executeCommand(name: String, groupId: Any? = null, command: () -
     return result as T
 }
 
-fun <T> runWithCancellationCheck(block: () -> T): T = CancellationCheck.runWithCancellationCheck(block)
+fun <T> runWithCancellationCheck(block: () -> T): T = CancellationCheck.runWithCancellationCheck(block)
+
+inline fun invokeLater(crossinline action: () -> Unit) {
+    ApplicationManager.getApplication().invokeLater { action() }
+}
+
+inline fun isUnitTestMode(): Boolean = ApplicationManager.getApplication().isUnitTestMode

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ApplicationUtils.kt.as40

@@ -46,4 +46,10 @@ fun <T> Project.executeCommand(name: String, groupId: Any? = null, command: () -
     return result as T
 }
 
-fun <T> runWithCancellationCheck(block: () -> T): T = block()
+fun <T> runWithCancellationCheck(block: () -> T): T = block()
+
+inline fun invokeLater(crossinline action: () -> Unit) {
+    ApplicationManager.getApplication().invokeLater { action() }
+}
+
+inline fun isUnitTestMode(): Boolean = ApplicationManager.getApplication().isUnitTestMode