Fatal error when modify read-only document

[anthonyaxenov]

Version: 4.5.1

Steps to reproduce:

1. Open git log
2. Choose any commit
3. Double-click on any file in that commit, read-only diff-viewer will open
4. Press Ctrl+Shift+A (or Shiftx2), find and choose Random UUID

Result:

com.intellij.openapi.editor.ReadOnlyModificationException: Attempt to modify read-only document
	at com.intellij.openapi.editor.impl.DocumentImpl.assertWriteAccess(DocumentImpl.java:698)
	at com.intellij.openapi.editor.impl.DocumentImpl.insertString(DocumentImpl.java:541)
	at com.github.leomillon.uuidgenerator.EditorDocumentUtils.insertTextAtCaret(EditorDocumentUtils.kt:32)
	at com.github.leomillon.uuidgenerator.action.GenerateRandomAction.actionPerformed$lambda-1(GenerateRandomAction.kt:29)
	at com.intellij.openapi.command.WriteCommandAction.lambda$runWriteCommandAction$4(WriteCommandAction.java:361)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.lambda$doRunWriteCommandAction$1(WriteCommandAction.java:150)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:947)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.lambda$doRunWriteCommandAction$2(WriteCommandAction.java:148)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:219)
	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:184)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.doRunWriteCommandAction(WriteCommandAction.java:157)
	at com.intellij.openapi.command.WriteCommandAction$BuilderImpl.run(WriteCommandAction.java:124)
	at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:361)
	at com.intellij.openapi.command.WriteCommandAction.runWriteCommandAction(WriteCommandAction.java:349)
	at com.github.leomillon.uuidgenerator.action.GenerateRandomAction.actionPerformed(GenerateRandomAction.kt:25)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.lambda$performActionDumbAwareWithCallbacks$4(ActionUtil.java:244)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:265)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAwareWithCallbacks(ActionUtil.java:244)
	at com.intellij.ide.actions.GotoActionAction.performActionImpl(GotoActionAction.java:111)
	at com.intellij.ide.actions.GotoActionAction.lambda$performAction$2(GotoActionAction.java:84)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:214)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:196)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:805)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:348)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:82)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:131)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:187)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:891)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:760)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:447)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:818)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:446)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:805)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:492)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[leomillon]

Hi @anthonyaxenov !

Thanks for the feedback but I'm not sure to understand the expected behavior with this issue?

[anthonyaxenov]

@leomillon at least plugin could handle this case and cancel execution, silently or maybe with notification like "You are in read-only viewer, generation is impossible here".

Actually, I think it would be better to disable any of plugin's commands in such cases at all. The term "read-only document" speaks for itself and, in fact, none of the plugin commands could be used here.

[anthonyaxenov]

Another propose -- when read-only document is opened, plugin could copy freshly squeezed UUID in system clipboard instead of trying to paste it immediately.