I've refactored the code based on recommendations from the contributors

Author: georgecheyne

src/GitPrompt.ps1

@@ -209,29 +209,6 @@ function Write-GitStatus {
     }
 
     $sb.ToString()
-
-    # If the user is running Powershell ISE then name the tab
-    if($psISE){
-        $repo = $Status.RepoName
-        $branch = $Status.Branch
-        $tabName = "$repo [$branch]"
-        #you can't have 2 tabs with the same name so shove a number on the end
-        $tabCount = 0
-        foreach($tab in $psISE.PowerShellTabs){
-            $existingTabName = $tab.DisplayName
-            if($existingTabName.StartsWith($tabName) -and $existingTabName -ne $psise.CurrentPowerShellTab.DisplayName){
-                $tabCount++
-                $tabNumber = [int]$existingTabName.Replace($tabName, "").Replace("(", "").Replace(")", "").Trim()
-                if($tabCount -lt $tabNumber + 1){
-                    $tabCount = $tabNumber + 1
-                }
-            }
-        }
-        if($tabCount -gt 0){
-            $tabName= "$tabName ($tabCount)"
-        }
-        $psise.CurrentPowerShellTab.DisplayName = $tabName
-    }
 }
 
 <#

src/PoshGitTypes.ps1

@@ -273,6 +273,8 @@ class PoshGitPromptSettings {
     [string]$DescribeStyle = ''
     [psobject]$WindowTitle = {param($GitStatus, [bool]$IsAdmin) "$(if ($IsAdmin) {'Admin: '})$(if ($GitStatus) {"$($GitStatus.RepoName) [$($GitStatus.Branch)]"} else {Get-PromptPath}) ~ PowerShell $($PSVersionTable.PSVersion) $([IntPtr]::Size * 8)-bit ($PID)"}
 
+    [bool]$TabTitle = $true
+
     [PoshGitTextSpan]$DefaultPromptPrefix       = '$(Get-PromptConnectionInfo -Format "[{1}@{0}]: ")'
     [PoshGitTextSpan]$DefaultPromptPath         = '$(Get-PromptPath)'
     [PoshGitTextSpan]$DefaultPromptBeforeSuffix = ''

src/WindowTitle.ps1

@@ -58,3 +58,45 @@ function Set-WindowTitle {
         }
     }
 }
+
+function Set-TabTitle {
+    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions", "")]
+    param($GitStatus)
+    $settings = $global:GitPromptSettings
+
+    if ($settings.TabTitle == $false) {
+        return
+    }
+
+    # If the user is running Powershell ISE then name the tab
+    if($psISE -and $GitStatus){
+        $existingTabNames = $psISE.PowerShellTabs | % {$_.DisplayName}
+        $currentTabName = $psise.CurrentPowerShellTab.DisplayName
+        $tabName = Get-TabTitle $GitStatus $existingTabNames $currentTabName
+        $psise.CurrentPowerShellTab.DisplayName = $tabName
+    }
+}
+
+function Get-TabTitle {
+   [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions", "")]
+    param($GitStatus, [string[]]$existingTabNames, [string]$currentTabName)
+
+    $repo = $GitStatus.RepoName
+    $branch = $GitStatus.Branch
+    $tabName = "$repo [$branch]"
+    #you can't have 2 tabs with the same name so shove a number on the end
+    $tabCount = 0
+    foreach($existingTabName in $existingTabNames){
+        if($existingTabName.StartsWith($tabName) -and $existingTabName -ne $currentTabName){
+            $tabCount++
+            $tabNumber = [int]$existingTabName.Replace($tabName, "").Replace("(", "").Replace(")", "").Trim()
+            if($tabCount -lt $tabNumber + 1){
+                $tabCount = $tabNumber + 1
+            }
+        }
+    }
+    if($tabCount -gt 0){
+        $tabName= "$tabName ($tabCount)"
+    }
+    return $tabName
+}

src/posh-git.psm1

@@ -78,6 +78,7 @@ $GitPromptScriptBlock = {
 
     # This has to be *after* the call to Write-VcsStatus, which populates $global:GitStatus
     Set-WindowTitle $global:GitStatus $IsAdmin
+    Set-TabTitle $global:GitStatus
 
     # If prompt timing enabled, write elapsed milliseconds
     if ($settings.DefaultPromptEnableTiming) {