Merge branch 'maint-1.6.0' into maint-1.6.1

* maint-1.6.0:
  Fix bash completion in path with spaces
  bash completion: only show 'log --merge' if merging
  git-tag(1): add hint about commit messages
  Documentation: update graph api example.

Documentation/git-tag.txt

@@ -63,6 +63,7 @@ OPTIONS
 	are printed when using -l.
 	The default is not to print any annotation lines.
 	If no number is given to `-n`, only the first line is printed.
+	If the tag is not annotated, the commit message is displayed instead.
 
 -l <pattern>::
 	List tags with names that match the given pattern (or all if no pattern is given).

Documentation/technical/api-history-graph.txt

@@ -148,22 +148,22 @@ outputting that information, if desired.
 ------------
 *
 *
-M
+*
 |\
 * |
 | | *
 | \ \
 |  \ \
-M-. \ \
+*-. \ \
 |\ \ \ \
 | | * | |
 | | | | | *
 | | | | | *
-| | | | | M
+| | | | | *
 | | | | | |\
 | | | | | | *
 | * | | | | |
-| | | | | M  \
+| | | | | *  \
 | | | | | |\  |
 | | | | * | | |
 | | | | * | | |

contrib/completion/git-completion.bash

@@ -935,6 +935,11 @@ _git_log ()
 	__git_has_doubledash && return
 
 	local cur="${COMP_WORDS[COMP_CWORD]}"
+	local g="$(git rev-parse --git-dir 2>/dev/null)"
+	local merge=""
+	if [ -f "$g/MERGE_HEAD" ]; then
+		merge="--merge"
+	fi
 	case "$cur" in
 	--pretty=*)
 		__gitcomp "
@@ -966,7 +971,7 @@ _git_log ()
 			--decorate --diff-filter=
 			--color-words --walk-reflogs
 			--parents --children --full-history
-			--merge
+			$merge
 			"
 		return
 		;;
@@ -1751,7 +1756,7 @@ _gitk ()
 	local cur="${COMP_WORDS[COMP_CWORD]}"
 	local g="$(git rev-parse --git-dir 2>/dev/null)"
 	local merge=""
-	if [ -f $g/MERGE_HEAD ]; then
+	if [ -f "$g/MERGE_HEAD" ]; then
 		merge="--merge"
 	fi
 	case "$cur" in