diff mode enabled against all buffers, which is what we want, and in
single window tabs, the desired buffer will remain.

This way a multi-window layout like "MERGED,REMOTE" behaves the same way
as "MERGED" after closing the "REMOTE" window. A consistent behavior is
clearly what most users would want.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 mergetools/vimdiff | 49 ++++++++++++++++++----------------------------
 1 file changed, 19 insertions(+), 30 deletions(-)

diff --git a/mergetools/vimdiff b/mergetools/vimdiff
index 2ecac41231..64a8fe170d 100644
--- a/mergetools/vimdiff
+++ b/mergetools/vimdiff
@@ -68,7 +68,7 @@ gen_cmd_aux () {
 
 	if test -z "$CMD"
 	then
-		CMD="echo" # vim "nop" operator
+		CMD="silent execute 'bufdo diffthis'"
 	fi
 
 	start=0
@@ -221,7 +221,7 @@ gen_cmd_aux () {
 
 	if ! test -z "$index_new_tab"
 	then
-		before="-tabnew"
+		before="-tabnew | silent execute 'bufdo diffthis'"
 		after="tabnext"
 		index=$index_new_tab
 		terminate="true"
@@ -336,17 +336,6 @@ gen_cmd () {
 	CMD=$(gen_cmd_aux "$LAYOUT")
 
 
-	# Adjust the just obtained script depending on whether more than one
-	# windows are visible or not
-
-	if echo "$LAYOUT" | grep ",\|/" >/dev/null
-	then
-		CMD="$CMD | tabdo windo diffthis"
-	else
-		CMD="$CMD | silent bufdo diffthis"
-	fi
-
-
 	# Add an extra "-c" option to move to the first tab (notice that we
 	# can't simply append the command to the previous "-c" string as
 	# explained here: https://github.com/vim/vim/issues/9076
@@ -555,22 +544,22 @@ run_unit_tests () {
 	TEST_CASE_15="  ((  (LOCAL , BASE , REMOTE) / MERGED))   +(BASE)   , LOCAL+ BASE , REMOTE+ (((LOCAL / BASE / REMOTE)) ,    MERGED   )  "
 	TEST_CASE_16="LOCAL,BASE,REMOTE / MERGED + BASE,LOCAL + BASE,REMOTE + (LOCAL / BASE / REMOTE),MERGED"
 
-	EXPECTED_CMD_01="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_02="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 1b | wincmd l | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_03="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 4b | wincmd l | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_04="-c \"set hidden diffopt-=hiddenoff | echo | 4b | silent bufdo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_05="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | 1b | wincmd j | leftabove split | 4b | wincmd j | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_06="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | leftabove split | 1b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_07="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | 4b | wincmd l | leftabove split | 1b | wincmd j | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_08="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_09="-c \"set hidden diffopt-=hiddenoff | echo | leftabove split | 4b | wincmd j | leftabove vertical split | 1b | wincmd l | 3b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_10="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_11="-c \"set hidden diffopt-=hiddenoff | echo | -tabnew | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_12="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 2b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_13="-c \"set hidden diffopt-=hiddenoff | echo | leftabove vertical split | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 2b | wincmd l | leftabove vertical split | leftabove split | 1b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_14="-c \"set hidden diffopt-=hiddenoff | echo | -tabnew | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | 2b | wincmd l | 1b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_15="-c \"set hidden diffopt-=hiddenoff | echo | -tabnew | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
-	EXPECTED_CMD_16="-c \"set hidden diffopt-=hiddenoff | echo | -tabnew | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b | tabdo windo diffthis\" -c \"tabfirst\""
+	EXPECTED_CMD_01="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_02="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | 1b | wincmd l | 3b\" -c \"tabfirst\""
+	EXPECTED_CMD_03="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 4b | wincmd l | 3b\" -c \"tabfirst\""
+	EXPECTED_CMD_04="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_05="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove split | 1b | wincmd j | leftabove split | 4b | wincmd j | 3b\" -c \"tabfirst\""
+	EXPECTED_CMD_06="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | leftabove split | 1b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_07="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | 4b | wincmd l | leftabove split | 1b | wincmd j | 3b\" -c \"tabfirst\""
+	EXPECTED_CMD_08="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_09="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove split | 4b | wincmd j | leftabove vertical split | 1b | wincmd l | 3b\" -c \"tabfirst\""
+	EXPECTED_CMD_10="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_11="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | -tabnew | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_12="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 2b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_13="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove vertical split | leftabove split | leftabove vertical split | 1b | wincmd l | 3b | wincmd j | 2b | wincmd l | leftabove vertical split | leftabove split | 1b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_14="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | 2b | wincmd l | 1b\" -c \"tabfirst\""
+	EXPECTED_CMD_15="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | -tabnew | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
+	EXPECTED_CMD_16="-c \"set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | -tabnew | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | 2b | wincmd l | 3b | wincmd j | 4b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 1b | tabnext | -tabnew | silent execute 'bufdo diffthis' | leftabove vertical split | 2b | wincmd l | 3b | tabnext | leftabove vertical split | leftabove split | 1b | wincmd j | leftabove split | 2b | wincmd j | 3b | wincmd l | 4b\" -c \"tabfirst\""
 
 	EXPECTED_TARGET_01="MERGED"
 	EXPECTED_TARGET_02="LOCAL"
@@ -635,7 +624,7 @@ run_unit_tests () {
 	cat >expect <<-\EOF
 	-f
 	-c
-	set hidden diffopt-=hiddenoff | echo | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | quit | wincmd l | 2b | wincmd j | 3b | tabdo windo diffthis
+	set hidden diffopt-=hiddenoff | silent execute 'bufdo diffthis' | leftabove split | leftabove vertical split | 1b | wincmd l | leftabove vertical split | quit | wincmd l | 2b | wincmd j | 3b
 	-c
 	tabfirst
 	lo cal
