VSE: Add sample tool

This tool is set as default tool, so default action on click doesn't have pernament effect.

Reviewed By: campbellbarton

Differential Revision: D7064

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -1807,6 +1807,21 @@ class _defs_sequencer_generic:
             draw_settings=draw_settings,
         )
 
+    @ToolDef.from_fn
+    def sample():
+        def draw_settings(_context, layout, tool):
+            props = tool.operator_properties("sequencer.sample")
+        return dict(
+            idname="builtin.sample",
+            label="Sample",
+            description=(
+                "Sample pixel values under the cursor"
+            ),
+            icon="ops.paint.weight_sample",  # XXX, needs own icon.
+            keymap="Sequencer Tool: Sample",
+            draw_settings=draw_settings,
+        )
+
 
 class _defs_sequencer_select:
     @ToolDef.from_fn
@@ -2348,6 +2363,7 @@ class SEQUENCER_PT_tools_active(ToolSelectPanelHelper, Panel):
         None: [
         ],
         'PREVIEW': [
+            _defs_sequencer_generic.sample,
             *_tools_annotate,
         ],
         'SEQUENCER': [
@@ -2355,6 +2371,7 @@ class SEQUENCER_PT_tools_active(ToolSelectPanelHelper, Panel):
             _defs_sequencer_generic.blade,
         ],
         'SEQUENCER_PREVIEW': [
+            _defs_sequencer_generic.sample,
             *_tools_select,
             *_tools_annotate,
             _defs_sequencer_generic.blade,