Fix GotoDiff for single line only

[watergear]

results in Git 2.10.0 and Beyond Compare 4.1.6

steps:

1. add hello.txt with contain "hello world!" and make commit with it
2. append "new line" into hello.txt
3. run Git: Diff All Files
4. stage changes by Git: Add All
5. remove line "hello world!"
6. run Git: Diff All Files
7. stage changes by Git: Add All
8. run Git: Diff Stages Files

output:

--- a/hello.txt
+++ b/hello.txt
@@ -1 +1,2 @@
-hello world!
\ No newline at end of file
+ hello world!
+ new line
\ No newline at end of file

--- a/hello.txt
+++ b/hello.txt
@@ -1,2 +1 @@
- hello world!
  new line
\ No newline at end of file

--- a/hello.txt
+++ b/hello.txt
@@ -1 +1 @@
-hello world!
\ No newline at end of file
+ new line
\ No newline at end of file

Press Enter Key on that - or + lines. Dump error message:

No hunk info

[kemayo]

How's it broken?

[watergear]

This code is failed for above diffs hunk = re.match(r"^@@ -(\d+),(\d+) +(\d+),(\d+) @@.*", hunk_line)

I have fixed it and will make pull request later.

[watergear]

pull request #494