#2268 Correct a version calculation for non-master mainline branches

Author: Kirill-Maurin

src/GitVersionCore.Tests/IntegrationTests/MainlineDevelopmentMode.cs

@@ -117,7 +117,7 @@ public void SupportBranches()
             fixture.AssertFullSemver("1.0.2", config);
 
             fixture.BranchTo("support/1.0", "support10");
-            fixture.AssertFullSemver("1.0.3", config);
+            fixture.AssertFullSemver("1.0.2", config);
 
             // Move master on
             fixture.Checkout("master");
@@ -126,9 +126,9 @@ public void SupportBranches()
 
             // Continue on support/1.0
             fixture.Checkout("support/1.0");
+            fixture.MakeACommit(); // 1.0.3
             fixture.MakeACommit(); // 1.0.4
-            fixture.MakeACommit(); // 1.0.5
-            fixture.AssertFullSemver("1.0.5", config);
+            fixture.AssertFullSemver("1.0.4", config);
             fixture.BranchTo("feature/foo", "foo");
             fixture.AssertFullSemver("1.0.5-foo.0", config);
             fixture.MakeACommit();
@@ -185,7 +185,7 @@ public void VerifySupportForwardMerge()
             fixture.MakeACommit();
             fixture.AssertFullSemver("1.1.2", config);
             fixture.Checkout("support/1.0");
-            fixture.AssertFullSemver("1.0.4", config);
+            fixture.AssertFullSemver("1.0.3", config);
 
             fixture.BranchTo("feature/foo", "foo");
             fixture.MakeACommit();

src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs

@@ -69,7 +69,7 @@ public SemanticVersion FindMainlineModeVersion(BaseVersion baseVersion)
                 mainlineVersion.BuildMetaData = CreateVersionBuildMetaData(mergeBase);
 
                 // branches other than master always get a bump for the act of branching
-                if (context.CurrentBranch.FriendlyName != "master")
+                if (!context.CurrentBranch.IsSameBranch(mainline))
                 {
                     var branchIncrement = FindMessageIncrement(null, context.CurrentCommit, mergeBase, mainlineCommitLog);
                     log.Info($"Performing {branchIncrement} increment for current branch ");