Having two projects open results in incorrect common ancestor commit id

[kpatenio]

When running the two projects at once, MergeConflictService will read one base id from one project and attempt to use it for another. This results in an exception VcsException: Invalid revision range.

Sample stack:

com.intellij.openapi.vcs.VcsException: Invalid revision range e4776a0b05642a27f92ef0e90219194ea2136ca7..HEAD

Command line: [git -c credential.helper= -c core.quotepath=false -c log.showSignature=false log --pretty=format:%x01%x01%H%x02%x02%P%x02%x02%ct%x03%x03 --encoding=UTF-8 --decorate=full -L3,+7:/Users/kpatenio/git/BobAndAlice/src/Foo.java e4776a0b05642a27f92ef0e90219194ea2136ca7..HEAD --]
	at git4idea.history.GitLogOutputSplitter.processTerminated(GitLogOutputSplitter.java:97)
	at jdk.internal.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.intellij.util.EventDispatcher.dispatchVoidMethod(EventDispatcher.java:123)
	at com.intellij.util.EventDispatcher.lambda$createMulticaster$1(EventDispatcher.java:86)
	at com.sun.proxy.$Proxy99.processTerminated(Unknown Source)
	at git4idea.commands.GitTextHandler$1.processTerminated(GitTextHandler.java:97)
	at jdk.internal.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.intellij.execution.process.ProcessHandler$2.invoke(ProcessHandler.java:246)
	at com.sun.proxy.$Proxy12.processTerminated(Unknown Source)
	at com.intellij.execution.process.ProcessHandler.lambda$notifyTerminated$2(ProcessHandler.java:204)
	at com.intellij.execution.process.ProcessHandler$TasksRunner.execute(ProcessHandler.java:279)
	at com.intellij.execution.process.ProcessHandler.notifyTerminated(ProcessHandler.java:187)
	at com.intellij.execution.process.ProcessHandler.notifyProcessTerminated(ProcessHandler.java:183)
	at com.intellij.execution.process.KillableProcessHandler.notifyProcessTerminated(KillableProcessHandler.java:136)
	at com.intellij.execution.process.BaseProcessHandler.onOSProcessTerminated(BaseProcessHandler.java:59)
	at com.intellij.execution.process.OSProcessHandler.lambda$onOSProcessTerminated$0(OSProcessHandler.java:202)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:170)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:629)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:581)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:157)
	at com.intellij.execution.process.OSProcessHandler.onOSProcessTerminated(OSProcessHandler.java:202)
	at com.intellij.execution.process.BaseOSProcessHandler$1.lambda$startNotified$0(BaseOSProcessHandler.java:96)
	at com.intellij.execution.process.ProcessWaitFor.lambda$new$0(ProcessWaitFor.java:51)
	at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:207)
	at com.intellij.execution.process.ProcessWaitFor.lambda$new$1(ProcessWaitFor.java:33)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
	at java.base/java.lang.Thread.run(Thread.java:834)