allow adding whole diff to patch

this was causing a panic

add integration test for toggling all commit files

test/integration/patchBuildingToggleAll/expected/.git_keep/COMMIT_EDITMSG

@@ -0,0 +1 @@
+blah

test/integration/patchBuildingToggleAll/expected/.git_keep/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

test/integration/patchBuildingToggleAll/expected/.git_keep/config

@@ -0,0 +1,10 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true
+	precomposeunicode = true
+[user]
+	email = CI@example.com
+	name = CI

test/integration/patchBuildingToggleAll/expected/.git_keep/description

@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.

test/integration/patchBuildingToggleAll/expected/.git_keep/info/exclude

@@ -0,0 +1,7 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
+.DS_Store

test/integration/patchBuildingToggleAll/expected/.git_keep/logs/HEAD

@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 7028eaec19b2723b62690974057c92ba7d8c1b11 CI <CI@example.com> 1648038005 +1100	commit (initial): first commit
+7028eaec19b2723b62690974057c92ba7d8c1b11 cf149a94a18c990b2c5cdd0cf15ec4880f51c8b0 CI <CI@example.com> 1648038005 +1100	commit: blah

test/integration/patchBuildingToggleAll/expected/.git_keep/logs/refs/heads/master

@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 7028eaec19b2723b62690974057c92ba7d8c1b11 CI <CI@example.com> 1648038005 +1100	commit (initial): first commit
+7028eaec19b2723b62690974057c92ba7d8c1b11 cf149a94a18c990b2c5cdd0cf15ec4880f51c8b0 CI <CI@example.com> 1648038005 +1100	commit: blah

test/integration/patchBuildingToggleAll/expected/.git_keep/objects/cf/149a94a18c990b2c5cdd0cf15ec4880f51c8b0

@@ -0,0 +1,4 @@
+x
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+�@@a�s����AD���HҔ
+[��9��Ƿx���j��S���i� "=R �]`\�D<F�t����(i�����\`�
b��1��2��O[�ӎ����S�T�Mo�ׇ�
+����ڧ���

test/integration/patchBuildingToggleAll/expected/.git_keep/refs/heads/master

@@ -0,0 +1 @@
+cf149a94a18c990b2c5cdd0cf15ec4880f51c8b0

test/integration/patchBuildingToggleAll/expected/one/two/three/file3

@@ -0,0 +1 @@
+test3