Restore packages on project build if it never happened before

To prevent VS going crazy on changing configurations we have to manually restore packages.
To optimize this process we skip restore if restore already happened or for builds outside VS (also should work for Rider),
New property DoInsideBuild is defined to be a mark of build from IDE, it can me changed in User.Directory.Build.props
in case some specific ide is needed to be detected.

Author: alex-kulakov

Directory.Build.props

@@ -33,6 +33,10 @@
     <DoGeneratePackage Condition="$(MSBuildProjectName) == 'TestCommon'">false</DoGeneratePackage>
     <DoGeneratePackage Condition="$(MSBuildProjectName.Contains('Tests')) == 'true'">false</DoGeneratePackage>
 
+    <!-- BuildingInsideVisualStudio is also true in Rider -->
+    <DoIsIdeBuild>false</DoIsIdeBuild>
+    <DoIsIdeBuild Condition="$(BuildingInsideVisualStudio) == 'true'">true</DoIsIdeBuild>
+
     <!-- Disable "BinaryFormatter is obsolete" warnings for test projects -->
     <NoWarn Condition="$(MSBuildProjectName.Contains('Tests')) == 'true'">$(NoWarn);SYSLIB0011</NoWarn>
   </PropertyGroup>

Directory.Build.targets

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <!--
+    Restores packages if needed. This helps VS to not go crazy on build configuration change
+  -->
+  <Target Name="DORestorePackages" BeforeTargets="PrepareForBuild"
+    Condition="!Exists($(ProjectAssetsFile)) AND $(DoIsIdeBuild)=='true'">
+      <CallTarget Targets="Restore" />
+  </Target>
+</Project>

User.Directory.Build.props.example

@@ -4,5 +4,10 @@
     <DoNugetFeedUserName>Put username here</DoNugetFeedUserName>
     <DoNugetFeedPassword>Put password here</DoNugetFeedPassword>
     <DoNugetFeedUrl>Put url here</DoNugetFeedUrl>
+
+    <!-- This allows to tell that build is from IDE in addition to standard "$(BuildingInsideVisualStudio)== 'true'" check -->
+    <!--
+    <DoIsIdeBuild Condition="$(DoIsIdeBuild) == 'true' OR <Put additional checks here>">true</DoIsIdeBuild>
+    -->
   </PropertyGroup>
 </Project>