Sequencer usability:

Brought back old tools "Remove Gap(s)" and "Insert Gap".
It's actually one of the first tools I ever coded for it in 90ies, so useful!

* Remove Gap(s)

This checks if there's no strip at a given position, and slides all strips
together to the left, until the gap is closed.

- BackSpace key, remove gap at current frame (or first gap at right of frame)
- SHIFT+BackSpace, remove all gaps at or to right of current frame.

* Insert Gap

Shifts all strips to right of current frame with 10 frames. (Amount can be
set in Toolbar redo panel).

release/scripts/startup/bl_ui/space_sequencer.py

@@ -284,6 +284,9 @@ class SEQUENCER_MT_strip(Menu):
 
         layout.operator("transform.transform", text="Grab/Move").mode = 'TRANSLATION'
         layout.operator("transform.transform", text="Grab/Extend from frame").mode = 'TIME_EXTEND'
+        layout.operator("sequencer.no_gap")
+        layout.operator("sequencer.insert_gap")
+
         #  uiItemO(layout, NULL, 0, "sequencer.strip_snap"); // TODO - add this operator
         layout.separator()
 

source/blender/editors/space_sequencer/sequencer_edit.c

@@ -988,30 +988,104 @@ static void UNUSED_FUNCTION(seq_remap_paths) (Scene *scene)
 }
 
 
-static void UNUSED_FUNCTION(no_gaps) (Scene *scene)
+static int sequencer_no_gap_exec(bContext *C, wmOperator *op)
 {
+	Scene *scene = CTX_data_scene(C);
 	Editing *ed = BKE_sequencer_editing_get(scene, FALSE);
-	int cfra, first = 0, done;
-
+	rctf rectf;
+	int cfra, efra, sfra, first = 0, done;
+	int do_all = RNA_boolean_get(op->ptr, "all");
 	
-	if (ed == NULL) return;
+	if (ed == NULL) return OPERATOR_CANCELLED;
 
-	for (cfra = CFRA; cfra <= EFRA; cfra++) {
+	/* get first and last frame */
+	boundbox_seq(scene, &rectf);
+	sfra = (int)rectf.xmin;
+	efra = (int)rectf.xmax;
+	
+	/* first check if the current frame has a gap already */
+	for (cfra = CFRA; cfra >= sfra; cfra--) {
+		if (BKE_sequencer_evaluate_frame(scene, cfra)) {
+			first = 1;
+			break;
+		}
+	}
+	
+	for ( ; cfra < efra; cfra++) {
+		/* first == 0 means there's still no strip to remove a gap for */
 		if (first == 0) {
 			if (BKE_sequencer_evaluate_frame(scene, cfra) ) first = 1;
 		}
-		else {
+		else if (BKE_sequencer_evaluate_frame(scene, cfra) == 0) {
 			done = TRUE;
 			while (BKE_sequencer_evaluate_frame(scene, cfra) == 0) {
 				done = insert_gap(scene, -1, cfra);
 				if (done == 0) break;
 			}
-			if (done == 0) break;
+			if (done == 0 || do_all == 0) break;
 		}
 	}
 
+	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
+	
+	return OPERATOR_FINISHED;
+
 }
 
+
+void SEQUENCER_OT_no_gap(struct wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove Gap";
+	ot->idname = "SEQUENCER_OT_no_gap";
+	ot->description = "Remove gap at current frame to first strip at the right";
+	
+	/* api callbacks */
+//	ot->invoke = sequencer_snap_invoke;
+	ot->exec = sequencer_no_gap_exec;
+	ot->poll = sequencer_edit_poll;
+	
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+	
+	RNA_def_boolean(ot->srna, "all", 0, "All Gaps", "Do all gaps to right of current frame");
+}
+
+static int sequencer_insert_gap_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	Editing *ed = BKE_sequencer_editing_get(scene, FALSE);
+	int frames = RNA_int_get(op->ptr, "frames");
+	
+	if (ed == NULL) return OPERATOR_CANCELLED;
+	
+	insert_gap(scene, frames, CFRA);
+	
+	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
+	
+	return OPERATOR_FINISHED;
+	
+}
+
+void SEQUENCER_OT_insert_gap(struct wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Insert Gap";
+	ot->idname = "SEQUENCER_OT_insert_gap";
+	ot->description = "Insert gap at current frame to first strips at the right";
+	
+	/* api callbacks */
+	//	ot->invoke = sequencer_snap_invoke;
+	ot->exec = sequencer_insert_gap_exec;
+	ot->poll = sequencer_edit_poll;
+	
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+	
+	RNA_def_int(ot->srna, "frames", 10, 0, 1000, "Frames", "Frames to insert after current strip", 0, INT_MAX);
+}
+
+
 #if 0
 static int seq_get_snaplimit(View2D *v2d)
 {

source/blender/editors/space_sequencer/sequencer_intern.h

@@ -97,7 +97,11 @@ void SEQUENCER_OT_images_separate(struct wmOperatorType *ot);
 void SEQUENCER_OT_meta_toggle(struct wmOperatorType *ot);
 void SEQUENCER_OT_meta_make(struct wmOperatorType *ot);
 void SEQUENCER_OT_meta_separate(struct wmOperatorType *ot);
+
+void SEQUENCER_OT_no_gap(struct wmOperatorType *ot);
+void SEQUENCER_OT_insert_gap(struct wmOperatorType *ot);
 void SEQUENCER_OT_snap(struct wmOperatorType *ot);
+
 void SEQUENCER_OT_strip_jump(struct wmOperatorType *ot);
 void SEQUENCER_OT_swap(struct wmOperatorType *ot);
 void SEQUENCER_OT_swap_data(struct wmOperatorType *ot);

source/blender/editors/space_sequencer/sequencer_ops.c

@@ -72,6 +72,9 @@ void sequencer_operatortypes(void)
 	WM_operatortype_append(SEQUENCER_OT_meta_toggle);
 	WM_operatortype_append(SEQUENCER_OT_meta_make);
 	WM_operatortype_append(SEQUENCER_OT_meta_separate);
+	
+	WM_operatortype_append(SEQUENCER_OT_no_gap);
+	WM_operatortype_append(SEQUENCER_OT_insert_gap);
 	WM_operatortype_append(SEQUENCER_OT_snap);
 	WM_operatortype_append(SEQUENCER_OT_strip_jump);
 	WM_operatortype_append(SEQUENCER_OT_swap);
@@ -213,6 +216,10 @@ void sequencer_keymap(wmKeyConfig *keyconf)
 	RNA_enum_set(WM_keymap_add_item(keymap, "SEQUENCER_OT_swap", LEFTARROWKEY, KM_PRESS, KM_ALT, 0)->ptr, "side", SEQ_SIDE_LEFT);
 	RNA_enum_set(WM_keymap_add_item(keymap, "SEQUENCER_OT_swap", RIGHTARROWKEY, KM_PRESS, KM_ALT, 0)->ptr, "side", SEQ_SIDE_RIGHT);
 
+	RNA_boolean_set(WM_keymap_add_item(keymap, "SEQUENCER_OT_no_gap", BACKSPACEKEY, KM_PRESS, 0, 0)->ptr, "all", FALSE);
+	RNA_boolean_set(WM_keymap_add_item(keymap, "SEQUENCER_OT_no_gap", BACKSPACEKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "all", TRUE);
+	WM_keymap_add_item(keymap, "SEQUENCER_OT_insert_gap", EQUALKEY, KM_PRESS, KM_SHIFT, 0);
+	
 	WM_keymap_add_item(keymap, "SEQUENCER_OT_snap", SKEY, KM_PRESS, KM_SHIFT, 0);
 	WM_keymap_add_item(keymap, "SEQUENCER_OT_swap_inputs", SKEY, KM_PRESS, KM_ALT, 0);