diff-alternate-reset-flag

diff --git a/source/blender/editors/animation/anim_channels_edit.c b/source/blender/editors/animation/anim_channels_edit.c
index 995ad861ec8..d98f99ae838 100644
--- a/source/blender/editors/animation/anim_channels_edit.c
+++ b/source/blender/editors/animation/anim_channels_edit.c
@@ -380,7 +380,7 @@ static void anim_channels_select_set(bAnimContext *ac,
         FCurve *fcu = (FCurve *)ale->data;

         ACHANNEL_SET_FLAG(fcu, sel, FCURVE_SELECTED);
-        if ((fcu->flag & FCURVE_SELECTED) == 0) {
+        if (((fcu->flag & FCURVE_SELECTED) == 0) && (sel != ACHANNEL_SETFLAG_EXTEND_RANGE)) {
           /* Only erase the ACTIVE flag when deselecting. This ensures that "select all curves"
            * retains the currently active curve. */
           fcu->flag &= ~FCURVE_ACTIVE;
@@ -3251,7 +3251,7 @@ static int click_select_channel_fcurve(bAnimContext *ac,
     fcu->flag ^= FCURVE_SELECTED;
   }
   else if (selectmode == SELECT_EXTEND_RANGE) {
-    animchannel_clear_selection(ac);
+    ANIM_anim_channels_select_set(ac, ACHANNEL_SETFLAG_EXTEND_RANGE);
     animchannel_select_range(ac, fcu);
   }
   else {
diff --git a/source/blender/editors/include/ED_anim_api.h b/source/blender/editors/include/ED_anim_api.h
index a436fa43989..09b85d0f4ef 100644
--- a/source/blender/editors/include/ED_anim_api.h
+++ b/source/blender/editors/include/ED_anim_api.h
@@ -530,6 +530,7 @@ typedef enum eAnimChannels_SetFlag {
   ACHANNEL_SETFLAG_INVERT = 2,
   /** some on -> all off / all on */
   ACHANNEL_SETFLAG_TOGGLE = 3,
+  ACHANNEL_SETFLAG_EXTEND_RANGE = 4,
 } eAnimChannels_SetFlag;

 /* types of settings for AnimChannels */