VSE: Add option to select handles with box selection

Patch adds an "Handle" option to the `SEQUENCER_OT_box_select` operator,
that allows to select the handles instead of whole strips.
Feature is mapped to Alt key modifier

A difference from the proposed design in T70730 is that covering the entire strip with the box actually selects both handles.

Reviewed By: iss

Differential Revision: https://developer.blender.org/D6372

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index ae1d63b5f93..6ebccf31355 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -449,7 +449,7 @@ static void drawmeta_contents(Scene *scene, Sequence *seqm, float x1, float y1,
 }
 
 /* clamp handles to defined size in pixel space */
-static float draw_seq_handle_size_get_clamped(Sequence *seq, const float pixelx)
+float sequence_handle_size_get_clamped(Sequence *seq, const float pixelx)
 {
   const float minhandle = pixelx * SEQ_HANDLE_SIZE_MIN;
   const float maxhandle = pixelx * SEQ_HANDLE_SIZE_MAX;
@@ -806,7 +806,7 @@ static void draw_seq_strip(const bContext *C,
   View2D *v2d = &ar->v2d;
   float x1, x2, y1, y2;
   unsigned char col[4], background_col[4], is_single_image;
-  const float handsize_clamped = draw_seq_handle_size_get_clamped(seq, pixelx);
+  const float handsize_clamped = sequence_handle_size_get_clamped(seq, pixelx);
 
   /* we need to know if this is a single image/color or not for drawing */
   is_single_image = (char)BKE_sequence_single_check(seq);