[PATCH (GIT-GUI)] git-gui: Make Ctrl-T safe to use for conflicting files.

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A previous patch added a check for conflict markers, which
is done when the file is about to be staged due to a click
on the icon. However, pressing Ctrl-T still immediately
stages the file without confirmation. This patch fixes it.

The check requires a loaded diff, so staging multiple files
at once won't work if they are unmerged.

Signed-off-by: Alexander Gavrilov <angavrilov@xxxxxxxxx>
---

 git-gui.sh        |    4 +++-
 lib/index.tcl     |   11 +++++++++--
 lib/merge.tcl     |    1 +
 lib/mergetool.tcl |    7 ++++---
 4 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/git-gui.sh b/git-gui.sh
index 4085e8f..717817e 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -2090,7 +2090,9 @@ proc toggle_or_diff {w x y} {
 	if {$col == 0 && $y > 1} {
 		# Conflicts need special handling
 		if {[string first {U} $state] >= 0} {
-			merge_stage_workdir $path $w $lno
+			# $w must always be $ui_workdir, but...
+			if {$w ne $ui_workdir} { set lno {} }
+			merge_stage_workdir $path $lno
 			return
 		}
 
diff --git a/lib/index.tcl b/lib/index.tcl
index b045219..d33896a 100644
--- a/lib/index.tcl
+++ b/lib/index.tcl
@@ -298,11 +298,18 @@ proc add_helper {txt paths} {
 	set after {}
 	foreach path $paths {
 		switch -glob -- [lindex $file_states($path) 0] {
+		_U -
+		U? {
+			if {$path eq $current_diff_path} {
+				unlock_index
+				merge_stage_workdir $path
+				return
+			}
+		}
 		_O -
 		?M -
 		?D -
-		?T -
-		U? {
+		?T {
 			lappend pathList $path
 			if {$path eq $current_diff_path} {
 				set after {reshow_diff;}
diff --git a/lib/merge.tcl b/lib/merge.tcl
index 5c01875..ac4c7de 100644
--- a/lib/merge.tcl
+++ b/lib/merge.tcl
@@ -40,6 +40,7 @@ The rescan will be automatically started now.
 		_O {
 			continue; # and pray it works!
 		}
+		_U
 		U? {
 			error_popup [mc "You are in the middle of a conflicted merge.
 
diff --git a/lib/mergetool.tcl b/lib/mergetool.tcl
index 6ab5701..1984c64 100644
--- a/lib/mergetool.tcl
+++ b/lib/mergetool.tcl
@@ -23,13 +23,14 @@ This operation can be undone only by restarting the merge." \
 	}
 }
 
-proc merge_stage_workdir {path w lno} {
+proc merge_stage_workdir {path {lno {}}} {
 	global current_diff_path diff_active
+	global current_diff_side ui_workdir
 
 	if {$diff_active} return
 
-	if {$path ne $current_diff_path} {
-		show_diff $path $w $lno {} [list do_merge_stage_workdir $path]
+	if {$path ne $current_diff_path || $ui_workdir ne $current_diff_side} {
+		show_diff $path $ui_workdir $lno {} [list do_merge_stage_workdir $path]
 	} else {
 		do_merge_stage_workdir $path
 	}
-- 
1.6.0.20.g6148bc
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